Its a cool phenomena! =)
I started last autumn buying a jackbot, now i have bride of pinbot as well and i am working on it as much as i can to get it top notch. However im allready thinking about what my next machine will be. I have put a maximum of 10 machines for my collection due to space (money, sure, but that will come in more along the way but space does not..). Don't know if i will keep that 10 machine limit or what will happen in the next years but its a strange hobby that seem to live its own life =)