I've seen a grand total of one of them in the Boston area (Somerville, to be precise), but Boston has never really been a big place for supercars... this is for two reasons:
1) General New England frugality.
2a) New England winters eat cars due to the salt and potholes.
2b) ...which means that you must garage your supercar for 3-4 months of the year because it's just not practical to use.
2c) ...which means that you have:
2c1) ...two cars (no big deal)
2c2) ...and the ability to garage one of them full-time for 3-4 months, which is a problem anywhere in the 617 area code because...
1) General New England frugality.
2a) New England winters eat cars due to the salt and potholes.
2b) ...which means that you must garage your supercar for 3-4 months of the year because it's just not practical to use.
2c) ...which means that you have:
2c1) ...two cars (no big deal)
2c2) ...and the ability to garage one of them full-time for 3-4 months, which is a problem anywhere in the 617 area code because...
2c2a) Boston Is Full.