This is one of those really cool use cases we (Zapier) couldn't have predicted. In fact, given the final behavior of Sacha's setup I still have a hard time reversing out the Zaps he used to make it! One of my favorite thing is seeing the new unique use cases folks come up with.
Let me know if there are some parts of my write-up that aren't clear. And thanks for putting together such a great service!
By the way, speaking of incentives Zapier's own referral program is very well done. It's quite fun trying to earn all the extra tasks, and I'm almost there!
