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.
You make a good point but we all purpose of holding crypto and how earning are not the same so some newbie can still spend some of their holding. However, that doesn't mean the place thrive as you presume cause a lot of project have offer the same service and they didn't but been partner with amazon and eBay should be Ok to make the project thrive and no sentiment should be attached to user payments.