I would doubt there's more money to be made in the Championship CJ.
Last years 17/18 season the pickings were as follows for the Prem.
Merit Money. £5,793,804. Swansea paid for finishing league position.
Every team gets £12,312,666.even if fewer than 10 games are chosen for TV. The rest get an extra £1,129,879 for every game over 10.
The following are equal amounts for all 20 clubs.
Domestic TV Income £34,812,558.
Oversees TV Income £40,771,108.
Sponsors £4,838,892.
Last season Swansea received £98,529,028 for their last season in the Premiership.
One would expect to see those figures increased for the coming season.
The above figure is purely for just being there. Can't see any Championship side coming anywhere near that figure.