unless you hear distortion you don't need amps. More power = louder. The corollary is that at less than "loudest possible level," you don't use full rated power, which is about heat failure, anyway, not about how much power the speakers can use and still stay accurate/linear.
I, like many around here, listen well below reference level, so I use less than a watt for average levels, and probably less than 50 watts for loud peaks (especially given that I have a sub and use bass management). My speakers just don't give a crap whether the 50 watts come from a 100 watt receiver or a 1000 watt outboard amp. Ohm's law prevents the watts from being different . . . .and my speakers can't see or smell or feel or taste whether there's more power in reserve than they are using, nor do they have a cerebral cortex to allow them to care, even if they could sense the difference somehow.