Nah, I think if someone is beating me pretty good and has proven to be the better player, I'm not going to do a bunch of checks that lead to nothing just so I can collect points. It might be part of the game, but it's cheap and pathetic.
If they have missed a perputal that you have seen, they have not proven to be better than you.
People who do perpetual checks when they are losing are finding a valid line of play to draw a game.
People who do perpetual checks when they are winning, on the other hand, need their head examined.