In Futuball there are are no fixed cost once you have created your club.

You earn money as you play from various things.

The only time you spend game money is when you want to do so - e.g. by buying new DNA strands, upgrading your stadium and upgrading your factory.

The game economy is build around that you can can save up cash if you want and this way be a rich club over time without spending any real money in the game if you got patience.