Basic question about power/watts

Hi everyone - I have a question that I can't seem to wrap my head around.  

I purchased a pair of Magnepans a few months back. Honestly, I do not like them. They have their moments but overall, pffft.

So, related to this, I keep reading from various Maggie owners you need TONS of power to make these things sing rather than squawk. I bought a new amp that is rated at 80 wpc at 4ohms. This, I realize, is low power when I see these guys saying they are running some crazy amount like 600 watts per channel. Here is my actual question:

When you are listening to your speakers at a normal volume, the wattage you are using is not near the POSSIBLE output, correct? My 80 wpc is unbearable with the volume at the 11 o'clock position. Why does a person need or want 600 watts? I suspect I am missing something here. Maybe this has to do with why I dislike my Magnepans. Somebody take a moment to set me straight?

Thanks!