Also, with regard to this thread most of what I had to say was summed up in
this post on page 1, but I will further say that I would wholly endorse this entire place becoming an ACTUAL regulated marketplace, but I don't know what sort of licenses you need for that or whatever.
If people don't like my markups, they should be able to come here and offer better prices, and so people can buy my action off of them instead of me, and I would be forced to lower my prices. Of course, they'd have to escrow, and there would need to be a whole system for that.
Also, I think this should only be allowed on a package basis - i.e. you can't come in here and short one event only, you'd have to short shares of the entire package. This protects sellers from having all their good values gobbled up by buyers. Otherwise, the clearly best solution is to run it exactly like a real futures market, and have bid prices and ask prices and things like that, but that would require a lot of regulation and a lot of work.
I still think that the ROI discussion is one that I'd be really interested to have, but I imagine it'll probably happen offline more than online. There are a lot of really smart people that disagree with me, but I know for a fact that I can mathematically prove a lot of faults in their arguments, and I imagine that there is a lot of stuff that I am convinced of that can be disproven as well.