I think given popularity of .io, the catch pronunciation, short, easily spelled, and a positive message, easily mid $$$$, possibly more. The .com and .net go to in use but inactive sites, probably a plus as well. I would try hard to sell it soon, as I think before .com is used would be better, and also I suspect that the current interest in .io will wane in a bit. It is a great name, and good luck with it.