of course you can make good business decisions in football. you can welcome one board member or another to the club. the board can employ one manager or another. the manager can employ one player or another.
using your own logic, why aren't all managerial decisions in all businesses leaps into the unknown? all staff employment can work out or not work out because of so many variables? and of course, just like football, many more businesses fail than succeed. some businesses are more successful than others. and at the top of the business league table there are huge debt levels.
some football clubs make money. it depends how they are run. so overall business and football sound very similar to me. then again, some countries are successful, and some are in huge debt, so maybe the whole thing is almost entirely based on luck.
No, football, sport, is completely unlike a regular business
For a start, regular business is not a zero-sum game. Markets are elastic, sport is not, each week there is a result and an updated table of winners and losers.
Good businesses know that if they position the right products at the right price and have them available then they will sell them. Costs can be predicted and controlled.
None of this is possible in football. If you predict your income conservatively and budget accordingly you will straight away be priced out of the market for players. You will then have to get lucky, because in football there is a very limited pool of available talent. In general business practice most people are just doing a job, the pool of labour is large.
I'd ask you to tell me any football clubs that regularly make money? In fact, I'll help you out: Real Madrid, Bayern Munich, Manchester United, Barcelona. That's it. Finished. Finito. There is no football club, other than those giant institutions, that makes money.
Peterborough I've always thought of as a club that makes the best of itself, buying players cheap and selling them dear. As of 2017 Peterborough United was technically invsolvent with a 1.4m loss that year and accumulated losses of over £11m. Reliant on loans from its Chairman.
I'll wager his actual business is not run in that way. And nor, I would say is the furniture business run by Notts County's owner.