For the same reason that there are rather few lady petrolheads, fanatical football or cricket supporters, darts players, and very much besides?
My partner is obsessed with music - endless music, a sunny beach (mostly for the water), and some bubbles - she'd thnk that she was in heaven. She likes and does not need prompting to mention any changes for the better here - we also have very similar musical tastes, but a Denon CDP/radio/amp and some decent bookshelfs is about as far as her choice would ever go.