I think a developer will have a goldmine with that. Or even (if legal I'm not certain or if steemit would want this as a separate website) but a way to easily bet with very minimal house gains. The spread could be almost nothing (possible pull from another websites api, but change the odds so the "house" gets only a small percentage of the bet.) I've never built this type before, but I'm sure there are some developers out there who may be interested in this, especially if the interest is there.

Another way to get non bloggers using steemit.