I have a few:
1: Only cars bought with microtransactions can be stored
2: Once in badsport you will have to buy your way out with microtransactions
3: In order to level up you will have to use microtransactions.
4: If you destroy someones personal car, you will be in dept @ the PS store. Use microtransactions to get out of debts or recieve a negative PS store wallet.
5: To lose wanted levels you will have to use microtransactions or you will be wanted until the end of time
Come on, post your ideas! R* needs our help!