What is the big deal? They usually are asking for more details on something I wrote. Rarely I get a 'random' PM from relatively new people. I would hope they would PM DickDV before PMing me if they have a question about drives or PM Tom Jenkins if they have a question about sewage treatment. Some times it does appear that the new people will PM those that have just recently posted instead of searching for the experts in the area they are interested in.
So is it the type of PM you are complaining about or the fact you get PMed at all? I see PMs as a handy tool.
I have PMed people asking for clarification on points.