I've made myself a couple 9-strings at times. Don't get excited, I don't mean 9 seperate strings, rather top three strings singles, and bottom three doubled, like half a 12-string. I sold both because the offers were too good. But not before getting some good use out of them. They were fun while they lasted. You can play 12-string strums and still do solos. They both had piezo's too, so you could really simulate an acoustic 12 very well, since acoustic 12's are usually EQ'd so chimey and thin in the mix anyway. The lack of doubled high strings and octave on the G really aren't missed at all. Especially when you think about how often that octave G string breaks.
As far as having multiple guitars, I do have tons of them, and some are very specific. For me it's not so much about budget as it is facility, since I make them, or buy some of them cheap and broken, and then resurrect them. Sometimes I'll buy a cheap used junker guitar because the store doesn't see that there's three good dimarzios or duncans in there. Then I can resurrect the guitar with pooper pickups from something else and get more than I paid, left with the pickups, or other parts. And everyone is happy! So I would say that if I just had to go buy all my various guitars and pay for the customizing, I'd probably have three good "multi-purpose" electrics total.