Spitfire / antique Ferrari
I think you'll find a few million more people have heard of a Spitfire than the Ferrari you mention !
I agree the 2-seat Spit's are not the best looking, but one's stuck with it...this may not have combat provenance, but it is a Spitfire, and will still make the hairs on one's neck stand up with that sound, or the wing plan sighted at a distance.
It would probably not actually 'pay for itself' as a business giving rides, that would just help towards costs, and as you say it's handy to be able to take up one's girlfriend or friends.
In the early 1980's, I had sailed with a chum to Itchenor, just south of Goodwood Airfield, West Sussex.
In those days, even in nice country pubs, 'Punk' was a fashion.
I heard a familiar sound in the distance, then sure enough the late Nick Grace turned up overhead, and proceeded to carry out a few wonderful, still powerful aerobatics.
The group of punks all stood up, transfixed, then started humming the Battle of Britain theme - they were not being ironic !