It doesn’t matter how much you spend - if your room’s bad you’re not going to be hearing all it can do. You could spend 100,000 on kit and not be hearing it’s full potential. In fact it could sound awful.
In theory if you spend those sort of sums you have a dedicated, treated space, but not necessarily. Certainly not everyone with 5-30k worth of hifi have listening rooms, and I consider this ‘spending money for good kit’.
If you can’t treat your room (or don’t want to - most often for aesthetic reasons) DSP room correction is a good solution to the problem.
Or sometimes you might just want more bass!!!