This sustainable model thing is a load of nonsense as you say, we're only interested in profits, the fans have been lied to from day 1 regarding the stadium move, I still remember when we were told there would be no point having a world class stadium without world class team in it and that the stadium would not affect transfer spending, very convenient that it did however.
We're owned by two billionaires, we don't need to be sustainable, I can remember people telling everyone how Chelsea will be screwed if Abrahamovic left. Guess what he hasn't left and if he did another rich guy would come along and buy them, seems to me their fans got the better end of the deal, top players, success and all without having to pay the highest tickets in the land.
Winning teams make more money in the long term anyway, the only problem is that it does take investment to make you winners, our lot are clearly just interested in profits now and not bothered about success on the pitch and at the end of the day if the fans are happy to pay to keep paying top dollar for the privilege of winning nothing and always being also rans it's not a bad deal for them.