The idea as far as Bob is concerned, is that the speakers were folks who he likes, likes their work and ideas, and could come w/o major expense or any out of pocket expense on their part. All are participating w/o asking any fee. Right now, we're helping with gas (up to a certain amount), lodging and dinner on Sat.
And this is being run as a not-for-profit event. The reserved seating is to cover additional expenses. As for sales by the presenters, no, at this time, we are NOT expecting any percentage.
I know based on the folks WE KNOW that are coming, that we'll be asking for help at the event, donated drinks, a pot-luck on Friday and possibly sponsors to cover any expenses (if we can’t with ticket sales.)
I hope this helps.