Okay I have this crazy idea. I think if this is properly implemented, it can bring tremendous value to SN users and owners. It's tricky, because there are perverse incentives everywhere you look. Here goes:

A sub dedicated to product reviews. The UI will have to be a bit different, more search oriented, because recent content is not necessarily going to be more relevant. Amazon reviews used to be reliable but they've gone to shit. I literally have no idea how to find quality products online outside of niches that I'm well-familiar with. In order to prevent spam, the posting charge would have to be somewhat high, and it would be limited to people who have been on SN for a while and for whom most engagement with SN is NOT via the product review sub. In other words, only people who use SN regularly and just happened to buy a product they like and want to tell others about it. People who appreciate the review tip with sats as with other posts. This is equivalent to the "people who found this review helpful" feature in Amazon.

I think this could be very useful to a lot of people. It's so difficult to find quality information in situations where there are strong incentives to game the system.