yep, there are but that's not what they are selling. I'm sure there are a lot of people that want to be able to puff in public places without drawing a whole lot of attention. I believe carrying a bong around to get high is probably not the best course of action. At home it serves its purpose although there are better ways to deal with your herb than that as well. I view this as a mobile solution and a viable one at that. Not only will this aid MMJ folks but the general population as well. This caters to a larger overall market.
If they can finally come through on their promises and deliver there will be no issues with making money. It's the under delivering that has been the problem to this point.