Does listening experience always improve in relation to how much you spend on equipment? Does the deity of Audio reward you for your financial sacrifice? Can you hear the difference a mains cable makes? Are signal wires directional? I am not in this camp myself.

However, amplifiers do sound different to each other. None are blameless. Listening tests are the ultimate criteria.

Magic components, wires and cables do not exist.

There is no substitute for good sound engineering.