Also consider that the last 3 times Favre DID get in, he couldn't be bothered to attend.
All that having been said, Culpepper is a fraud, and it's not like there are a lot of great QBs in the NFC... hard to call it a "snub", though.
I agree - Favre not showing up the last 3 years probably didn't help. I don't think Favre gives a toss about the pro-bowl - he wants another ring or two.