My wife is supportive of my musical endeavours - she has attended gigs, puts up with late dinners twice a week due to rehearsals and when it comes to gear acquisition she has been known to utter the phrase in the guitar shop "if you like it then you should get it".
It makes me sad when I hear of people with unsupportive partners, tales of hiding new basses from them, suspicions of cheating just because they're out playing a gig and other stuff.
It's vital to me to have a supportive partner because frankly I'm a weak, passive person who would probably quit playing to keep the peace.