Most peoples' answer to this depends on how long they've been in crypto.

If I was a brand new arrival absolutely not. Why would you? There are options that are non volatile and less hassle. Obtaining your crypto would've been a grind.

If you're sitting on a pile of free gains then why not? Time to realise them by buying some junk.

The latter are in a minority so I don't think any such place would thrive. And most of the time the existing places like this charge you more money for the honour of paying with crypto with much worse choice. I'd never take a shittier deal because of some sentimental attachment to my payment method and anyone who does is a numpty.

I'm happy to spend a bit of it because it's become a valuable asset to me. I may as well make use of some of the value that has accumulated. I guess that means it's still primarily an asset to me and not a currency.

Of course I would. I'd rather trust myself with my money than Paypal or any Credit cards.
Cryptocurrency could be the ultimate tool to create a worldwide open market.
And this is going to happen sooner as people are being aware how insanely they are charging us for using our own money.

Sure I will,this is a opportunity to circulate my cryptocurrencies ,for this reason maybe the altcoins will have functions and not just for holding and for speculative purposes

And also this will prove that it’s not only bitcoin who has a value,but all of the legitimate coins for they are created with same purpose and that s to help people around the globe

it will 100% depend on trust because bitcoin does not have a charge back so when i see a store that only accepts bitcoin i have to first be able to trust that store not to be a scam. and so far i have seen some stores that were "like" Amazon but they weren't that trusted.
but if it was indeed trusted, then my answer is yes and i have used some in the past.

but if i wanted to see something new, i would prefer something "not-like" Amazon because Amazon is centralized and that design doesn't match bitcoin's decentralized nature. so i would prefer to see a decentralized marketplace instead. and that already exist too and it is called Open Bazaar

There are ways you can use your cryptocurrency to pay for goods at amazon already.
This crypto payment processing company purchases goods using the lightning network as described here
https://www.coindesk.com/you-can-now-shop-with-bitcoin-on-amazon-using-lightning
Then there is purse.io which uses a third party to connect cryptocurrency payments for these goods using giftcards at a discount. They have been around for a while now.

It all depends on what benefits could I get if I use this site or online store .
Because there are other online store that would give an option that pays COD and if I use Bitcoin it means I would pay before the shipment be deliver ,
And there is a problem about it sometimes it could be a scam because they could sent you a false item and here in the Philippines it always happens so that is why I only choose COD when shopping online.

To be honest, I would hesitate to use BTC in buying stuff on online stores at this point. I still do not have that much that I can spend freely. If I get more profit, then I would be more willing.

Shipping fee is only normal on an online shopping sites . Usually you will incure a higher shipping cost if your from a province area  but the transaction fee will always be dependable on the price of cryptos  .  

The lower the cryptos value the lower the fees and the higher the cryptos  value the fee will also be higher  . Online shopping is not for all especially if you a budget person  , you will always find online items expensive than on local  .

I think such webshops are future. In general people would like to have the place with large spectrum of goods where they could spend their coins because people like the feeling that Bitcoin actually have the use in real life.
The problem for merchants and for buyers as well is volatility. When there will be some solution that could overcome that, shops accepting cryptocurrency would become normal.