All that really matters is how well the amps work with the speakers you are using. If you're upgrading to improve some performance aspect (for example, need more power on a difficult speaker), that makes sense. But most times it appears that people are bored and are changing for something new, but that's not limited to amplifiers.
Upgrading amplifiera.
A number of audiophiles upgrade their amplifiers. Is this a futile quest for the holy grail or are those upgrades a smarter way to dramatically improving the sound then purchasing a new one.