I have Moon 400M monoblocks which are approximately $5k each.
I think they sound great.
I’ve heard monoblocks that are $25k and higher (Martin Logan and PBN audio). Different systems and the difference I’ve noted is the dynamic impact and detail.
Does that mean all $25k amps will have more details and dynamics than all $5k monoblocks...certainly there will be exceptions. Is the difference worth the cost, that’s a question for the specific person spending their money.