What do you mean? There is still a demand and people trading btc in a decentralized exchange and market price

not only nothing is stopping them from doing that but also all of them are already faking their volumes in order to compete with each other and get a higher "rank" among exchanges. it doesn't have to be a constant buy/sell either there are other ways of faking the volume. it doesn't really affect the market that much though because traders don't look at volume, they look at price movement and if they are willing to buy in a way to increase the price (hence create the incentive for people to buy a certain coin) then so be it, there is nothing wrong with that since it is actual orders from their users they are filling!

in practice this is not possible because you want to be able to trade somewhere and so you have to sometimes accept negative sides and the risks in order to continue trading. and that is why people are still using centralized exchanges despite them being risky or in some cases even shady. so when they lose money they still come back because they accepted the risk. in a way that is the price of wanting to trade.

that works but only for those who DONT want to trade and want to only make an investment (basically dump their fiat for bitcoin)

P2P trading also has its own downsides, risk and problems. low liquidity, scammers, lack of speed,... and lots more are some of the issues you will be facing.

Nothing. Many exchanges are already faking their reported volumes. For example, volumes from almost all asian exchanges are obvious bullshit and their administration is totally satisfied with this.
The other point is P2P exchanges are completely different from the ones, that allow margin trading and give its users a leverage. It is two completely different things that only named with the same word.
In P2P exchanges people are just buying or selling their shitcoins in order just to get this coin, while when you deal with margin trading people are constantly buying and selling the same coins to get some profit out of price fluctuations.

from what I know, most of the exchanges use a representation of the token or coin, and if they are the owner of the site, they can have 0 fees when trading, meaning they can buy and sell large amounts of volume at no cost to make them appear on the volume charts you just showed.  

I know how blockchain could stop that with p2p trading and internal fees in the wallet. Like shown in Ardor and Bitswift network wallets. Where the trades take part between users instead of 3rd party. But how do you know these webpage exchanges are honest?  what does "Real volume" mean when the tokens are not on the network OR lets say I own Binance, Bitfinex or Liquid the 3 exchange claiming to have "honest volume", I have a account with 0 fees, I can manipulate that volume no?

So how do we know these 3 exchanges are honest?

What does this do? The Monkey see monkey do effect.  It is why people viewbot on twitter, twitch and youtube, Same thing.

I will prefer exchange to p2p any time any day if not for a number of hack's that have taken place on some exchanges they still remains the best when it comes to trading coin's and some exchange don't even take fee during trading. The only misfeelings am having on some exchanges lately is their fake trading Volumes.

there is the possibility that the volumes of certain exchanges are a bit inflated, but i believe this does not happen with large exchanges such as binance, poloniex, bittrex, however dex(forkdelta, idex) are a good alternative to classic exchanges...

Keeping your coins in your personal wallet is recommended of course you can't easily trade it unless its on the exchange and what you need is volume. P2p has its downside   so you just can't find someone that will bid higher on decentralized exchanges. If you wanted to sell in bulk your altcoins on dex, you would have to pick a bid which more likely cheap price.

Well, not all deposit their coins in exchanges wallets without the intention of selling or trading them right away. If you keep your coin in the an exchange wallet just for the reason of keeping them there then be ready to say goodbye to your coins. Holders do keep their coin in their private wallet, when when they see the price is good then they are moving it an exchange wallet for trading then move back what they’ve trade for to their own private wallet.

Weather it is a P2P exchange or a centralized one with a middle man, Either way you still turn your bitcoin into fiat. Now Localbitcoins used to be the way to get bitcoin and then exchanges started to appear and people started to lose a lot of money because of "hacks". take mt.gox, bitfinex, poloniex, quadriga for example. You give your bitcoin to them it is now theirs, in a p2p exchange it stays as your until you trade it. It is not constantly in someone else's hands. It is like giving your money/work/wealth to a bank and trusting they will hold on to it, and then stuff like this happens

 

As p2p exchanges start to open their doors more, It wont matter if there is someone in your country to buy it with fiat. You will be able to buy it anywhere in the world for anyone willing to sell it and obtain more fiat.
It will be like https://localbitcoins.com/ just in a wallet or client like the bitcoin core. Where trusted users and money changers will dominate the market.