Is there a feature to save private notes on members? Obviously I could keep my own spreadsheet, but it would be nice to have it integrated. I sold my first game in awhile, and I'm reminded of some of the poor behavior here. Not necessarily bad enough to leave negative feedback or block the user, but enough to note that I should proceed with caution.
For example, I made an agreement with someone to sell a game. The day after he promised he would buy it, he assured me he wasn't ghosting me, then I never heard from him again. I didn't even bother asking what happened, I had a lot of people interested in the game. This idiot cost me a few days and wasted emails, but without knowing the entire story I'm not ready to block the guy or leave negative feedback.
Maybe it already exists, but it would be nice if I got an offer on a game and I could click on the user and see my personal notes. Great buyer, unreliable, shady, pays with pennies, etc.