The SBD was an initial incentive. Ideally it would be upvotes for long term, (this was sort of my experiment to see who would get involved). I can work out things with you about costs/monthy rewards. I need to figure out how exactly this system would be funded long term.. (revenue from dtube network should suffice for now) having nodes compete for cheapest prices would keep the costs extremely low and scalable also. (right now usage is an issue because there is not a lot of people posting yet). Definitely something that will be sorted out in the future, right now its start small and smart.