I have done a few of these. We charged $25 per table (only 1 company per table) and each vendor had to donate an item with a value of at least $20 to be raffled off. I wouldn't ask for a portion of the vendors profits, only because, they may not sell anything on site, most vendors do these shows to get their names out, get leads, book shows, and recruit. Some will sell cash & carry items, while others may take orders.
I don't have time to go into all the details right now, but you can email me at
and I would be happy to give you more info.