Quoted from dsuperbee:Most mods don't add squat to the price. Exceptions are color dmd and invisiglass. Those are great since you can always pull them and sell and break even.
Other mods, (toys, leds, etc) don't add to the price for me at all.
Normal upkeep (rubbers, rebuilding flippers, etc) don't add anything either (and I HATE when people add the cost to a pin)
Invisiglass is a nice to have but not worth the cost IMO. Color DMD, yes.