B&K floats the ground on many of their amps. My M200 Sonata's are 150 amps p-p and there's no ground. I'm not sure what this says about the prospect with other manufacturers though.
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High-current amps are no different than other amps in respect of floating grounds. Do it if you must, to eliminate ground-loop hum; otherwise use the ground.
Altho I had to float all my 3rd-wire grounds before I rewired my listeningroom, personally I would not buy a 2-wire powercord for an amp that has a 3-wire ground.