I know of aome of this sort of thing happening aroiund about, not sure if they are quite legit lol but I think it is a great idea, all the demos I have been to have been good, bascially the seller brings the stuff, people turn up pay cash and leave. It is always nice for the hostess to get some knd of reward for her efforts too, such as a % of sales or free items to certain values.

Good luck