I have no problem with the pros entering, on any given day anyone of us can beat anybody else. Sure, the pro might win 8 out of 10 matches, but today might be one of those other two.
Just a side note, I bowled in Louisville recently, and saw the final standings for their city tourny, with Mike Wolf winning the all-events actual, with a mindnumbing 2397 for 9 games. He didn't win singles, doubles, team, with or without handicap, but all-event was his going away.