I've seen many Kickstarters that have limits on certain rewards. I've never created one so I can't say for sure... but perhaps if you can set all your rewards w

I've seen many Kickstarters that have limits on certain rewards. I've never created one so I can't say for sure... but perhaps if you can set all your rewards with limits you could at least keep it from being a runaway. That would at least give you a window and certainly an absolute top end (if all reward levels sell out).