It seems kind of obvious but the AFC as a whole is significantly stronger than the NFC. For that reason the players elected to the team are a little more spread out amongst teams from the AFC. That is the explanation for the 12-2 Cowboys have 11 Pro Bowlers in comparison the Patriots 8 despite the Patriots having a better record and beating the Cowboys. Pro Bowl roster spots are not determined by wins, though they do have an influence, the spots are determined by votes. If your conference is stronger you have more competition. The Cowboys play in a weaker conference so there are less good players which in turn means more Pro Bowl spots.
Though it is not the end of the world for players not making the Bowl, it is certainly appreciated. If you have a problem with Welker not being on the team, there is still hope. He can be added by the AFC coach, or if an injury takes place. As a member of the Patriots, a true team, where players are not jockeying for individual attention I am quite sure that many fans feel he has been snubbed more than he does.
For the rest of the Pro Bowlers from the Patriots, they have a nice little vacation to look forward to after the Super Bowl.
Keywords: brady, champs, england, moss, new, new england, patriots, pro bowl, snub, super bowl, welker