This never fails to amuse me.
Folks will pay $200, $300 for a mod - a plastic toy that blocks gameplay or artwork, and may or may not light up - and have a game where the GI either dosen't dim or flickers when dimmed, and inserts that have a cold hard "on/off" cycle.
I mean, to each his own. I'm one of the guys that would pay $150 and have the LEDs be stealthy.
(For any operators out there, this is also proof that LEDding a game can hurt profits, too - when out in California a few years back, a nice arcade near my hotel had some mid-2000's Sterns. They were in fantastic condition! Clean, fast-playing. But they had LEDs installed. The gameroom was dimmed - dark, and while I don't remember the specific game, it had some fast on/off lightshows - the brightness dropping to almost blackness was too much. Couldn't see the ball, and took away from the fun of playing. I did not continue my game, I didn't play the game again. It wasn't a fun experience.)