At least that would give members the options to see what work has been done, if any, and any type of review.
I looked at this post from @xIsabel38 , http://xenforo.com/community/threads/developer-review-divisionbyzero.67858/ and then searched the "Third Party Service Offers"... and came up with nothing started by @DivisionByZero
I realize it will never stop all people from doing the same type of thing, but with this area, maybe members could look there first. But with an area added, the review could be posted there and easily accessible for all, instead of Off-Topic where it is likely to get pushed down the listing considerably.
Maybe doing this method, and anyone wanting custom work is approached by someone not in that particular area could have them post there first, so at least that have a chance to leave a legitimate review (if work has been done) ..... (and a chance for the person to reply to the review)
Yes, their might be some reviews that are "fake or stretched stories" as well, I suppose that might be the major downfall, but the same thing happens at times with add-ons as well.
Either way, just trying to see if anything can be done for the end-user experience regarding custom work.