Because they don't let me answer at watchtower anymore!!!!!
Mostly I post cause I think it's a mutual exchange, if I don't give to the community it's not very respectful of the community that has given to me. I have had people extend the simple kindness of giving there insight on matters that have concerned me so I should do the same. Sometimes the simplest comments have helped me so I reason that even if I don't have any great wisdom, a reply of any sort by me lets the poster know that there is someone out there listening that cares. We are all here supporting each other in some way or another and posting is one way we do it.