I buy stuff from pretty much all of the 3D places, even the lesser ones like Artstation, Gumroad. etc. I've had to make many returns at Daz, too many to count, a few returns at Renderosity, I think 2 actually, and I've never had to make any returns at RenderHub or Renderotica. So As far as trust goes, having product testers really means nothing. There's been many horror stories of the low quality product that is allowed at Daz. There are vendors there who do nothing but make figures with duplicate formulas, there is a "star" vendor there who pretty much does nothing but take other people's models, and then make HDRIs out of them. Sometimes going as far as repackaging free HDRs from polyhaven. I will never buy anything from him. And lets not get started on the NFTs, the Yellow AI fiasco, or the short lived Daz AI web thing. There's vendors there who make very nice looking products in the promos, but which are almost universally unuseable, because of the poly count, texture size, etc. I have a blacklist of vendors at Daz because of this. It's that bad. 

Allowing reviews on a site is the biggest factor in trust. I'd rather have honest criticism in the comment section for a product than rely on unknown product testers, who may or may not have an agenda. if you are getting something for free to test, of course you are going to be swayed by that and not give a completely honest critique or you most likely won't be asked to do product testing again for that vendor. We all know how this works. You can look at the movie industry or videogame industry, the insiders who get freebies to test are never (or rarely) completely honest with criticisms. Whereas, 10 reviews from average end users who paid for the product and tested it on there own, are much more trustworthy to me.

So I have no problem spending money at Renderhub or Renderosity who both allow end user reviews. I can see right away which vendors and products to avoid. If you can't allow reviews on your site from the end user, that is a huge red flag to me. Daz has always been vehemently opposed to this for "some reason". They seem to think people will spend money on a product only to viciously leave unwarranted bad reviews. And yet this is not a problem at any other site, odd isn't it? "The wicked flee when none pursue" comes to mind.

I only rarely spend money at Daz anymore, and its only because they have an extremely liberal return policy within the first 30 days which is at least a safety net. Unfortunately, I have bought things there which have been broken past 30 days by studio updates or updates by the vendors themselves. So to be honest my trust for Daz today is lower than all the other stores combined. It wasn't always like this, i used to spend thousands a year there.  It's also creepy that they have their mods patrol these boards as well and do damage control here.