The way Ticketmaster has ruined the industry also makes it so hard to even consider things like this, at least in the US. Basically, damned near every venue, band, and promotor in the US is locked into Ticketmaster/Livenation.

The solution, at least for the smaller band, is to take sats at the merch table, or find ways to take it online (is there Bitcamp But Takes Sats?). The really big ones would probably have a harder time pivoting.