So I've done a few deals here on TB and have perfect feedback (so far) I try to make sure my buyers are happy with the deal and provide good positive feedback on every deal. A few weeks ago, I did a deal and, as usual, checked with the buyer to make sure everything was cool. He said it was and I started to close the deal by doing feedback for him. Well, he didn't reciprocate. I gave it about a week and sent a friendly PM reminder that I left positive for him. Another week went by, with no feedback. I sent another PM, asking if something was wrong...again, no response. I've seen in his profile that he's done lots of deals and given lots of feedback, and he's been on every time I look, so it's not like he's an infrequent flyer. So why might a dude be blowing off a simple customary gesture of TB kindness? How do you guys deal with such situations?