I don't think there's much significance to the ratio (though it is an interesting question). The amount of music I buy is related to many variables - budget, time to listen, urge, what's new, etc. It's never because I've listened to everything I have and I'm bored, but I also don't stop buying just because I haven't listened to everything I've already bought.
Gear purchases are driven much more by budget and expected performance gains for the experience of listening to the music. I'm much less inclined to spend a lot now on gear because I really enjoy what I have. When something happens that convinces me a substantial performance gain can be had, I'll look to get it. It'll probably be several thousand dollars, so that'll immediately throw the ratio off, at least momentarily.
It is an interesting question, much more so based on actual cost than retail, IMO. I have about 800 CDs at an avg price of no more than $10, so that's $8000. My current system (the music part anyway) cost about $10000, so it's pretty close to 50/50.