If you went through 2500 wheat cents, found that one, and didn't find any others - you're missing something.
On average I find one listable RPM or doubled die in every two rolls, and this particular variety is so obvious most people pull it out before the coins get to me. I only find one of these out of every one thousand or so rolls.
So logic dictates that if I find a die variety in nearly every roll, and I find one of these in every thousand rolls, the same would be true for anyone else. So given that you went through 50 rolls, you should have found at least 20-25 decent RPMs or doubled dies and you got lucky to find this one.
Moral to the story - keep looking, and pull out anything that looks like a doubled die or RPM. You may get lucky!