I pay just under $100/mo to insure a 1 of 724 (in the US) Boxster Spyder for 7,000 miles a year. For comparison, my 10-year old Mazda Miata ran me $62/mo with identical coverage, and was worth about 10% as much. However, unlike the Miata, I have declared value insurance because the car is worth 15% more than when it was new. Miata had typical depreciation insurance.

Tires more expensive? Yes, because they're bigger. ~$1500/set versus $1000/set (shipped, mounted and balanced) for the Miata, and the rears wear out about twice as fast.

Maintenance? If I went to a dealer for service, labor rate is 24% higher compared to a local Mazda dealer. I instead go to one of the best Porsche independents in the US and he's about 12% more than a local Mazda dealership, and he has way cooler stuff in his garage (last time I went, three 959s, a one-of-17 TechArt CTR3, and other craziness). Though still lots I can do myself.

Parts? I did a full brake job recently, and it cost ~10% more than something like a Subaru WRX STi. I actually used uprated brake fluid (which was +$20 over OEM), though everything else was OEM.

The only major long-term expense is engine rebuilds. Figure 25-30% more than rebuilding a mainstream V8 like a Toyota 1UR/3UR, Ford Coyote or Chevy small block. Though that's usually every 15-25 years (depending on engine hours at high RPM), so that's something you just sock money away for well in advance.

Insurance can be weird. For a while I was paying less for insurance on my 2008 Dodge Viper than I was on my 2001 Ford Mustang GT. It's all risk tables.

Insurance rates are all determined categorically. Mustangs have a higher “accident rate” because they’re cheap and fast and young people with lower incomes, who are also most likely irresponsible, buy them and crash them.

Vipers aren’t exactly in the same group. It’s not performance based, just statistics.

Yep, exactly.

Aren’t Mustangs more common and thus easier to steal?

Why would they be easier to steal because they are more common? Criminals have more experience with them?

More common cars are easier to sell (or sell parts from) after stealing, and easier to avoid getting caught after stealing.

The act of stealing them may not be easier, but the enterprise of stealing them is.

they're also involved in far more accidents.

I feel like I’ve seen more busted up GTs than anything else. I guess it makes sense when you build a 400hp muscle car and sell it for less than $30k.

Lol true

Janky Mustang GTs are everywhere

my 2015 cayman 6speed costed less than my 2016 audi s3 for insurance. no accidents in 6+ years

How can you have had a 2015 car for 6+ years? This doesn't make sense.