Surprisingly, in the online world we think everything is different and that nobody buys things without a free trial of some kind, but over and over again I see products and services that sell without a free trial.
I think it's doing early stage products a disservice to assume you have to have a free trial to make money. When you are proving out if a product will sell, you need to know if people will pay you money for it, not if they are casually interested in trying it.
If it don't make dollars, it don't make sense.