Lots of good FUD posts recently!
Fwiw, I bought this roadster for having fun. Didn't bought it to 'worry' about what could go wrong. You know, there are more or less 30k unique parts on this car and each and every one of them are a subject to fail a way or another. That is a whole lot of worrying, in case you are into that fear thingy
RE 'cost' of maintenance; personally I've spent on average $123,986 annually (lol). Nothing catastrophically failed mechanically (apart from the AOS). Those cost are only for fun mods.
Good luck with your upcoming Boxster