For me, it needs to be a business with a solid growth curve or cut it loose. This goes beyond equipment costs for me; there is personal time and the general distraction of knowing it exists and that responsibility ultimately falls to me if something goes haywire :)
It isn't a system that can be easily open sourced. It requires extensive setup.
Another direction I'm contemplating is a kickstarter campaign.
For the people who think the value is diluted with more users, I offer these two thoughts:
1. The information is already publicly available. You may have a first responder advantage, but that's about it.
2. If a first responder advantage is important to you and worth money to you, there are a variety of approaches that would separate you from the crowd: text message alerts, autoresponding, keyword bidding, etc.