C'mon Rig- don't let it get you down!
Just this week alone I have received at least 10 PM's asking for help and of those less than half got what they needed and were never to be heard from again. Not even a reply, and some of the responses I researched and spent quite a bit of time on- kinda pisses ya off.
BUT- then you have most people that truly appreciate the help and let you know- that makes you feel great! Don't let the minority dictate your helpfulness! Some people are just "takers"- who cares?
Have fun and keep doing what you are doing- writeups are fun!