It is a common misconception that Ferrari can ban you from buying their cars. However, this is not true. While Ferrari may not sell you a car if they believe you will misuse it, they cannot legally prevent you from purchasing one from another source.
The only way Ferrari could technically ban you from buying their cars is if you were to violate the terms of your purchase agreement. For example, if you agreed to only use the car for racing and then attempted to use it as a daily driver, Ferrari could theoretically void the contract and refuse to sell you any more cars.
However, in reality, Ferrari is much more likely to work with customers who violate the terms of their purchase agreements than to outright ban them. So long as you're willing to follow the rules set forth by Ferrari, there's no reason why you wouldn't be able to buy one of their cars.