I think that if you did this again, you should try it via a lottery system, for just a single order at a time, or a very small handful of orders. Also, anyone who has already placed an order shouldn't be a part of that lottery. Also, now that you have a better idea of how much of an investment this is on Kristin's part, if you ever did this again it could be for a very specific time period, maybe only a few times per year. Ultimately, if this is still more that $50 worth of work on Kristin's part, it just can't be sustainable.