The main problem I see is that most paid themes and plugins overvalue the product and are priced way too high.

As a "consumer", I'm a big supporter of products that are priced reasonably with a first year price and a discounted price for subsequent years of support and updates.

It would also be nice if there was some kind of consensus on multiple site pricing. Some products only work for 1 site, then 5, then 10, then unlimited. Others work for 2, then 10, then 25, then unlimited, etc...

And products that support a single site are hurting themselves by not supporting a primary site and dev site (2 sites). I can't tell you how many plugins I've NOT purchased because the price for more than 1 site was too expensive and I needed to install it on a live site as well as a local dev site.