What did you decide on the 570? TomE got the 12C. I browse the 570GT from time to time. Wouldn’t worry about maintenance too much. Every dealer I spoke with offered an annual package (~$4,000) that included bumper 2 bumper and the 12M/10k annual inspection & Service. When you break that out the service and inspection is about $1500 so 2500 per year for full coverage including towing and loaner (supercar equivalent) isn’t that bad.
Came close on multiple 570s but finally decided not to pull the trigger. Maintenance and service costs are just insanely expensive even if I did most the work myself. Front brakes? $12k just in parts. Battery? $3-6k.

I also feel like I got it out of my system after numerous extended test drives. It's exciting and really cool, but it's true when you hear people say the power isn't useable on the street. I found myself wanting a manual transmission and more engaging drive in my sportscar instead of an adrenaline filled exotic supercar rush that I was terrified of breaking all the time.