Wouldn't be too hard, to be honest. I'm a developer and it could be done pretty easily, I think the main issue would be having to convince end users/visitors to the site that the person(s) curating the items purported to be of the highest quality/best value, knows what they are talking about (no offense, lol). I think it's a good idea, actually, I just don't know how you'd get past that hurdle...the technological aspect of making the site itself is negligible nowadays, I am sure if you are here and know how to use Bitcoin you are technically proficient enough that you could be guided if necessary to teach you to the extent needed to build such a site.

On the actual subject, I too am a big fan of purchasing higher quality items for things I need, even if it's initially more expensive, it's well worth the time to do some research and figure out what isn't complete garbage. This is especially true, IMHO, in a few specific areas -- one such one being the chair I sit in at my desk. Of course, it might be initially expensive when I say I spent ~500 USD on a computer chair, but, it's one of the best purchases I've ever made. I spend enough time in it, and those shitty cheap chairs will kill your back. Same with a mattress, always good to buy something higher quality.

Unfortunately, that's not so easy nowadays, even brands which have had a lengthy history of making quality products, I'm finding fun little surprises where I learn that the company got sold to some investment fund or to a foreign conglomerate and while the name is the same, their products bear little resemblance to what made them famous initially.