Generally-speaking, I think high-tapping is a way to compensate for not doing high-quality flipper assembly rebuilds. If you maintain the game well, you don't need to high tap.

I don't high-tap my games. I do sometimes put LEDs in to reduce the voltage drain. But I'm a big fan of making the games play the way the original designers intended. When you make the flippers a lot stronger you throw the balance and design of the game off. I also feel the same in many circumstances with clear-coating playfields, although I'm a proponent of it when it is necessary to preserve the game.

If you put a game on location, it's a different matter. High-tapping a game can probably increase the machine's earning and make the game more appealing and have the core functionality be solid for a longer amount of time. Tim Arnold is a fan of it for those reasons IMO.. if casual players like it and it earns, do it. But in a controlled environment where you want the game closest to the way it was originally designed, I advise against high-tapping.