I really think that you might want to give it for free in a "Beta phase". Get some traction, add features and design and then charge for it.
As said before there are much more robust themes for $10 more.
Going beyond that, non developers find wordpress to be somewhat difficult to implement, making it easy would generate additional interest.
Its easy to say "lower your price", but that has a probability of not working and simply lowering your revenue/profit.