Sell as many as you need to afford staying home. So long as you (or yours) have the drive to stay home with them, then do it. Kids are rad and the more time you can give them, the better! Maybe sell your big $ pins and replace them with something new and cheap. There are some good $1k-ish titles (I liked my SF2 and POTO and love my Cyclone) that you can replace your $4k - $6k titles with. Then you can still have a bunch of machines and be the cool people on the block AND stay home with the twins. Just my 2 cents.

Good luck!