You ae right, all we can do í stay awake to everyone that maybe a scammer so that we (can) protect our money, not to waste money in the wrong place that gives you  no profit

ther is one problem like this, I invested 0.01 BTC in a 110% investment plan and after the end of plan, I receive total 0.0986 BTC because of Bitcoin price raising lol

No, we can't say not risky when invest money Bitcoin! Example: a people buying Bitcoin in highest price, after 3 days, the price fall down more than the price they bought, they scared and sell all Bitcoin with a big loss
About people have skill in trading: Not anyone can guess 100% the price will go to the way they think, if you win 100% in trading, I think you is a god of market

Any investment has risk, that is the first thing you must understand and never forget, the second thing to know whether you are capable of accepting the risk or not, if you are not then stay away from crypto currencies, stories of people losing tens of thousand of dollars while shorting bitcoin are not uncommon, but if you think you can handle the risk then bitcoin can be a great investment.

Yeah sometime you invest in a HYIP site by Bitcoin but counts your investment by $, sometime you will earn more or less than what you expected

There is always a risk in the world of money and we all know that bitcoin is way better money which is a crypto-currency to be exact that can make transaction through internet. And if there is a risk we also need to do our best to lessen it because the risk is just a part of investment and aside for the possibility and a wider future of bitcoin we can also look forward to its development for us to make it happened. And for us to have a goal on investing to bitcoin.

So basically, no one knows if the price of bitcoon would rose or would fall down, but as far as I can see right now, I think it's hard to stop the rising of price of bitcoin because the demand of it is high, we all know that if a product is on a high demand, the price would also rise and with that, I'm pretty sure that bitcoin would rise and regarding about the risk, of course in every invesment there is always a risk and it's up to you if you would take this as a opportunity and don't see it as a risk.

Yes that is why investment is consider as too risky because you doesn't have sureness that it will success. If you want to invest your money make sure first that the site is trusted and has a good background.

What you are telling is the basic thing which every investors have to know about it before going for investing, but in my point why to invest bitcoin in other investment when bitcoin purchasing and storing itself is a big investment as you can see the price of bitcoin how it is moving.