As written , @ghdprentice post doesn’t deny that there is an asymptote, but rather that some individuals are willing to spend limitless amounts of money to get every last drop of sonic benefit.
Those people are entitled to do that and I am not being critical. However many of us believe that the biggest improvement occurs when one gets out of budget gear and ascends into the low high end. Past that improvement is audible but the value equation becomes less favorable. Whether or not this matters to a given individual is a personal choice