I don't think I would like that set up. These people don't know your product, so if someone has a question, they probably would not know how to answer depending of what it was. Are you responsible for misinformation? Sounds like if they are working in "commission" they might say anything for the sale. You also have booth fees, so is that on top of the 15% you also have the give them? Also, those fees seem really high for 2 days. Not sure where you are from, but I have never heard of these. I have heard of pop-up shops, where the owners of the business run them just like a regular store for a set amount of time, like a month. Every area is different, so like Candybee said, if you are comfortable doing it, then go for it