Premium cabins tend to be a very small proportion of overall seats and are about overcharging for a little extra legroom and service rather than trading off operational flexibility for unique luxury though. Big difference between charging 3x economy rates for 2x the space for a carefully estimated proportion of seats in a mixed configuration (no brainer) and hoping your layout is so good it justifies thirstier, less flexible aircraft to operators (tough sell)...
That said, Boom's customers - if they ever exist - will be a new business class pay extra for supersonic flights category anyway.
That said, Boom's customers - if they ever exist - will be a new business class pay extra for supersonic flights category anyway.