The P.M. was my phone number Dave. Often times it is a lot easier for me to explain a process I do over a conversation. It also affords the recipient a way to reach me on the fly much like my email. I understand what you are saying and I rarely use them to post ideas or procedures but sometimes it works. I am not trying to be secretive it was just a way for me to offer help sometimes.
FWIW... Using PM's deprives the other members of a learning opportunity... Also deprives the recipient of the wealth of knowledge this forums members have to offer...