What are the requirements to buy a Ferrari?

Generally, as with most cars, the only requirement is having the money to pay for one. However, in the case of the rarer models like the Enzo - Ferrari need to 'approve' you to own one. This means submitting a resume (specifically listing all the cars you have owned) and meeting with Ferrari managers. If they are convinced you will be a fit owner - then they will accept you money and hand you the keys.