i once played on fifa manager (excuse the foul language), and with the money you earn in your career, you can donate it to the club your at, and when you have enough, you can buy it

there was also a pathetic option to buy houses and cars etc. i think the donations to your club and buying of clubs is a good idea because theres not much point having all that money and you cant do anything with it :\
another thing i liked was you had an option to learn a new language, not just the country you were residing in, this helped communications with other players etc. and made you more wanted by foreign clubs, so youd click the drop down menu and choose one of the languages to learn, you could only learn one at one time obviously.
also you could build youth camps in other countries, with different qualities to choose from varying in cost, and from these youth camps, youd get good youth players which you can bring to your club
i know this could be seen as copying them, but it would really improve the game i think