Annual costs are about $1000 and every three years you need to change the cambelts, which will be about $3-4K. If you wear out the clutch, count on $4-7K.
If you have to worry about maintenance costs, do not buy one.
My experience is that annual costs are closer to $1500 - 2000. Given these cars now range in age from 10-16 years, I expect their costs to start increasing as things like rubber bits and electronics start to wear or fail. My estimate does not include items like convertible tops or F1 pumps, for which I have not added to the projected cost curve.
And it does not include a reserve for unexpected failures, such as, heaven forbid, a dreaded cam belt failure.
But I completely agree with your last comment. As a search here will amply document, ours is a pay-to-play sport, and not one for the faint of heart. If maintenance costs are a concern, these cars are definitely not within one's means.
Deaner, if you are seriously considering a 360, I strongly suggest you do a thorough search on the forum, there is a great deal of info posted on the model. Download and read the buyers guide, and talk to one or more of our sponsors.
Welcome to the forum and good luck with your search!