Honestly, I think the blame falls primarily on the shoulders of the buyer. If you take just a few minutes to do some insight into the seller themselves (see if they make useful forum posts/have good reputation), as well as read the most recent pages of the thread, there should be more than enough information to come up with a decision. By reading a couple of recent reviews, you get a pretty good idea of the service you'll receive. If there are no recent reviews, you can either take a risk (and be willing to take a loss if it sucks), or you can look for another service. Since there are so many service threads as stated numerous times throughout this thread, you shouldn't have any trouble finding at least one that works.
You can't expect the mods to write out a detailed review of the service just so you don't have to research and figure out which ones are going to work. Even if they did write a detailed review, it still wouldn't mean a whole lot, since the seller can change whatever they are doing behind the scenes at any given time.
My Suggestion: Add some sort of rating system for the threads, but make it reflect only recent ratings. Not sure which way would work best, maybe average rating in the past 30 days, or average rating from the past 10 orders. This would prevent services from being good at first, and then going bad once they have a handful of good reviews. With a rating that is constantly updating, and can drastically shift with a few bad reviews, it would ensure the seller never half-asses it. It may also invoke a bit of competition between sellers who are trying to get the highest rating, and thus improve quality across the board.
The problems I see with this is the system being abused by fake buyers, so maybe only Jr. VIP+ could actually rate the service. Obviously it's not a perfect idea, or probably even the best idea, but like I said -- I don't think much change needs to be made in the approval/selling process, but rather in the buying and research process.
