They are rich that is for sure.
The most expensive Ferrari is the Ferrari FXX. It costs 2.5 million USD ($2,500,000) and the owner can only drive it on special track days approved by Ferrari.
The most common profession is Politician; as that is now considered its own profession - ignoring that, the most common non-political profession is Lawyer / Attorney.
The most common model Ferrari is the Testarossa and just under 10,000 have been built.
Lawyer
By far the most common profession was the military. A poor man could enlist and upon retirement have either land or a cash bonus plus his savings that he accumulated over the years. Another common profession would have to be the "world's oldest profession", for both men and women.
The most common are carbon fiber inserts and floor mats with Ferrari logo for the interior and tailpipe tips and rims for the exterior, It depends on what model of Ferrari you own.
Lawyer and Military
Speaking in Japanese
Most are owned by regular people and not celebrities etc. A list of owners is hard to obtain outside the Ferrari Club Of America and other type clubs. The owner of the company is Luca Cordero di Montezemolo who is the chairman of Fiat who owns Ferrari. Piero ferrari, the descendant of Enzo ferrari only owns 10% ---- The Fiat Auto Group
The most rare Ferrari is the 250gto.
Law is the most common profession among the US presidents.
The most common profession of Congressman is the law.