Absolutely impossible to be a consitent team without money.
You could win a Cup if you went all in and forgot about the league. That's fine, you would have a Cup, but the next season you wouldn't be able to win it again because you made no money ;) (fortunately this will change now, with the new attendance formula)
It's not about the money, you know, it's about being able to compete at the top level for seasons and seasons, not for a season or two, and for that you need to plan your financial part very carefully, overwise you might do well for a season and two and then fail to keep up with all those well-organized teams.