Sonny,
Wow! From a woman's perspective, I thought So. Cal. salon prices were high! I do most of my salon treatments in Los Angeles and more specifically, Beverly Hills.
Trying to justify this, I figured out MY expenses for comparison...Lord knows I need those treatments :)
I spend $148.00 combined on hair, manicure and pedicure, eyebrows, and waxing - before tip (which depending on service is between 20-35%) every 2 months, and if I tipped 35%, I'd be just under $200.00...well, the nails are done every 2 weeks, so I guess that'd put me at $262.00 total before tip...
Nevermind, now I'm in trouble!
Bringing up that issue WILL most definitely be a fight, but dude, she's paying high prices. Do you live in NYC?...you on the other hand are getting your fix at 'auction' prices...no comparison! It's apples and oranges as far as women are concerned...especially IF she doesn't enjoy YOUR hobby as much as you do!
Heck, you could LIVE without (I know, it's blasphemy) cigars, but don't think for one minute that she'll live without her salon treatments! LOL!
I think you need to take the "it's a hobby, sweetie. I really enjoy it and it's so relaxing" approach and MAYBE if you feel lucky, you might add something like, "and I know how much you enjoy doing your 'girl' stuff at the salon and mall...you KNOW how great you feel afterward!"...
Good luck!
But I think I'd have the invoices mailed somewhere - ANYWHERE - else than home! Learn from the gurus here!