I don't think it was ALL about the cash.

Personally, I think many of these rich musicians (Springsteen, dudes from KISS, etc) really think they're smarter than everyone else and that we should do what they say.

As for the $$$, back in the day, musicians made money from albums. Now, the ONLY real way for them to make $$$ is touring. Couldn't tour unless everyone was vaxxed.

And... they may make $$$ but they could very well spend $$$$$.