1) Sell your children when they're still young and cute, and definitely before the expensive teen years OR
2) if you just have to keep the little buggers, remember two words, "community college". Just one lousy year at a good university=several very pricey bikes.
OR
3) Sell your body. I tried this, but I ended up owing money. If you saw this body, you'd understand.
OR
4) when your house "accidently" burns down, take pictures and borrow receipts of all your friends expensive stuff for your insurance claim...and while you're at it, downsize to an efficiency apartment or, better yet, a tent and sleeping. You'll be surprised at how much money will be left over for bikes.

Good luck. Be sure to post how any of these work out.