Yea seems like I can get feedback maybe 30% of the time and mostly only as a buyer when I leave feedback first. As a seller I usually just see it was delivered but not even a PM confirming delivery or anything which has worried me in the past, but I figure no news is good news, but I do wish I could get feedback as a seller. Most annoying was when I went though hurdles to do my first purchase since I had no feedback at all, and asked the seller to give me feedback so at least maybe I would be more trusted on my second transaction, and still nothing.
Correct me if I'm wrong, but I thought leaving feedback is one of the rules of the sales forum, and something agreed to in every sale. I'm not really sure what can be done, but I do think maybe there should be some attempt to make it more mandatory as every other rule is so strictly enforced.