Here's the problem for the dealer. What happens if the amp is damaged in shipping? What happens if you choose to return it and it is damaged when it is returned? What happens if you scratch it or otherwise mar it and then return it?
Who files the insurance claim and how long does it take to get paid? If the dealer files an insurance claim, does his insurance premiums go up?
If you really need to hear the amp, why don't you go pay the dealer a visit and listen?