I have actually been using Doctor M's philosophy lol, I will quote,

"Newbies and lurkers need not apply."

I get a ton of PM's for invites, links, for me to burn and send copies(like I am a Store lol and can afford to do this) and other stuff, well the first thing I do is look at their join date, and then I follow Doctor M's words above lol.

To me it seems like 90% of the invites I have given out were hit and runners, a lot of them are orphaned now so I am very picky about handing them out now.