Sorry Jim, I have to disagree with you on this point. For example,
this £250 amplifier, which is very popular within disco/band circles carries a 4000W badge, however is typically found driving two separate channels of audio with transducers rated at 4Ω or 8Ω, and drawing no more than 3-4A.
I've lost count of the times I've provided stage power for DJs and bands that bring their own PAs to events, often consisting of 2 or 3 of the type of amplifier I've linked to above, all happily running together through their mandatory off-white supermarket branded 4-way block. I'll meter their circuit around 10A-11A... then listen to said DJ or bassist's drivel about their "awesome 20k sound system"...
A power rating alone absolutely does
not suggest a rig is high end. In fact the opposite is far more true. A professional loudspeaker cabinet with similar driver arrangement may be 15dB more efficient than it's "disco" equivalent. Compare a budget cabinet rated at 95dB/1W/1m with a high end box rated at 105dB/1W/1m. All things being even, the budget box needs 4,096W to play to 126dB, whereas the professional cabinet only needs 128W... and that's leaving aside thermal compression, which would make the gulf even greater.