i thought the same when i bought mine, was lovely, still is, well looked after...but they do and WILL go wrong !! but they are a pleasure to own, great when they are all going good, and a nightmare when they are not
things like the key fob/imobilser, nothing to do with servicing and mainetence, can be a nightmare every now and then, and wear and tear things wear and break, but they are great fun to drive and that king of the road feeling, id say they cost about a grand a year to keep on the road wouldnt be far off
tbh, i dont think it would be the most reliable if only driven a few times a year and a p38 would not like that and long periods of time not being driven of weeks/months at a time in between the odd drive
good luck, enjoy it, make the most of it until its tear hair out time , and most of all- keep it serviced and maintained and give it a good looking over