Flying in business class is much different than flying in economy or premium economy. And it's not just a few extra inches of extra legroom.
While it varies from airline to airline, in business class you can expect (for international flights):
--seperate check in area at the airport;
--use of the business class lounge with free food, booze, more comfortable seating and free wifi;
--lie flat seats onboard if you want to sleep;
--adjustable seats to get in a more comfortable position and more room to spread out;
--separation between the seats;
--better service on board;
--free drinks during the flight
--deplaning before economy
--the use of noise cancelling headphones;
--if changes need to be made they will be of assistance. On my current trip over, my flight was cancelled and they automatically booked me on another flight. I didn't like their choice so I called and got what I wanted. On my next trip, my return flight was cancelled and I was moved to a better flight with the same seat as the type of aircraft is the same.
For most airlines, profit comes from business class and first class passengers as well as cargo. Economy is mostly just a break even. (Except discount airlines.) They want to keep their upper class passengers happy.
And in times of Covid, I appreciate not having to sit side by side with another passenger. My business class seat is in its own little cubicle.