Always funny when people start talking about sports clubs being "run as a business" and "investment". Surely everyone understands it is simply not like that? Sign up to run a club, sign up to a black hole, which will greedily suck in whatever money you leave in the vicinity, that's it.
Nobody but nobody ever makes a "profit" from their "investment" and if universal advice exists then to every club owner in the world - get out now and cut your losses!
No owner can truly make a club only spend what income it receives, because this is impossible, all have to draw on outside funds, beg borrow or steal. That is not to say you shouldn't have a businesslike approach, of course you should and I'd wager ours is much improved on recent administrations but that said, we must surely still be piszing loads of cash down the drain, and somebody surely must be constantly dipping into somewhere to keep funding it. This is not just us. This is every club. Please people, be realistic.