@douglas_schroeder All mechanical switches degrade, period.
That's quite a blanket statement... what is the mechanism by which this degradation occurs?
Putting a cheap switch with poor materials is a superb way to diminish sound quality.
I don't really understand why something needs to be expensive to be effective... a silver contact switch is pretty much as good as it gets (maybe mercury wetted contacts are better). Gold is non-reactive so sensible if the switch isn't sealed as silver will corrode. Rubidium is entirely unnecessary unless your equipment is in a corrosive environment in which case you have other problems.
A switch is just a contact between two conductors like the contact between the cables and the terminals on the amp and speakers. As long as the switch is correctly rated and makes a good contact it should be fine. One advantage of inexpensive solutions is that they are easy to try for yourself.