The technical problem for price discrimination based on the user's location is that location can be faked. The social problem is that, even if you succeed, user

The technical problem for price discrimination based on the user's location is that location can be faked. The social problem is that, even if you succeed, users who are paying more will feel ripped off. I think a better approach is to allow users to pay what they want (maybe with a specified minimum). If it's pitched the right way, some users will happily pay more than you'd charge them, but you're still letting poor (or stingy) users get your software, and (as a side benefit) those users may also recommend your product to others. So the net profit could be greater than if you charged a fixed price.