You actually think zero profit isn't a good business model? Read your last sentence back and tell me you'd think the same if you ran your own business.
The profit is still there, it hasn't vanished into thin air, it's there for us to use, to invest further, it keeps us from looking over our shoulders should something bad happen.
Ask owners or fans at clubs like Swansea & WBA in their current state how they'd feel being closer to zero profit with what they did last year compared to us. The two best financial figured teams, Spurs & Liverpool both competiting in the Champions League final to me really does say it all about how vital the running of a clubs figures are to its trickle down effect. If we need to spend we can spend, the same cannot be said for roughly 75% of the leagues clubs who are at large solely dependent on their owners money, not the clubs.
Zero profit is never a good business model, in any walk of life so why football is seen as any different is completely beyond me.