The thing is, in my experience the other stores (tsquid, etc) aren’t really game specific, so your game-ready, lowpoly model simply gets lost among the hundreds of similar products. As a result, it won’t sell well.
Also because some game models have quite some technical requests (poly number, texture resolution, skinning, animation stuff), and small errors or unreadable format can make it totally bad for the engine, I think people usually don’t like to buy models for engines from general model sites. Converting one format to another is a PITA, makes errors, pipeline is a mess, etc.
The unity asset store solved this, since models and other stuff there are sure to be unity-compatible, and that is an incredibly safe feel for the purchaser, that the model will surely be useful. Also the asset store is moderated, in theory you can put up a cube in tsquid, add a picture of a high-poly character, and charge 200$ for it. Though you will be banned after that, actually nothing prevents you from doing this.
I have some models on Tsquid, and some on asset store, and even very similar products sell much better on the asset store than on the squid.
And assetstore gives 70%, squid 40%. Sure, squid handles the support, but assetstore lets you get in touch with your customers, which can be a bit more work, but also a lot more rewarding (you get more feedback, connections, etc).
So I totally stopped uploading anything to tsquid. If I would do models for advertisements, films, etc, then it would be a better place, but since I create stuff for games, it is far better platform to me.
Yeah, I am waiting on the CryStore too 