Tournaments for stuff

Why are there no websites that have free rolls or small money tournaments for stuff ? like case of pop, cartoon of cigarettes, laundry detergent, simple everyday items. Just a thought? Would be great/cheap advertisement for them

It's true it would be a good advertising, but I doubt it would interest most of the people as much as a cash prize.
Plus you have to take into account the delivery costs, so it would have a very limited number of places paid.