Last week I gifted a couple of wedges to stranger because he was pretty good in our match, but he had starter wedges and he was frustrated.
He never said thanks.
Several months ago, I gifted a couple of wedges to my p in an Alt Shot match for the same reason. He did say thanks, but later, when I went to his profile to say, "your welcome, enjoy" I saw that our opponents in that match had posted a comment that said I was "a multi-accounting dirtbag and the he should try to get as much out of me as possible" or something to that effect.
That comment is still on his wall.
Mostly, I don't really care what complete strangers think about me, but the old adage, "No good deed goes unpunished" definitely has some truth to it.
I'll still send gifts when the mood strikes me, but that mood happens less frequently than it used to.