I think investors are limited by what cash they can inject into the club. The only way to increase revenue is through lowering wages, selling players and the the commercial arm of the club, Merchandising, ticket sales, advertising etc.

Where it gets murk is if Tony Bloom decides to sponsor the club shirt for a ridiculous amount. Or in the case of City you get your Arab mates through their companies to do the same thing.

It's why FFP doesn't work it would be a lot easier if they simplified the rules and allowed those who had money to inject it into the club legally. FFP should be about stopping clubs borrowing too much money as Pompey did.