Yeah, I suppose me and a bunch of other fans really were lucky to receive responses - I suppose he was getting relatively little fanmail back then, since now he says he has time only to grab a handful from a large heap. Although people keep trying and getting autographs still, so there's always a chance
Luck and probability I guess.. He is indeed getting a lot of fun mail, I heard he stops writing personal notes now as well. I would do anything for an autograph but I would never spam him, it is beneath me xD
A wild thought came to me, what if Peter has a secret DA account and is currently following you ?
Honestly, I wouldn't send anything on my own either, since I always think that the last thing celebrities need in their lives is my moderately shitty fanart, but it was a group event and I kinda gave in XD
Ohhh, that would be really unlikely, I'm afraid XD And also very embarrassing.