That's not a problem with open source software, that's a problem with a business model of trying to sell an application when anything digital can be infinitely replicated. You can do the same thing with Windows, OSX, etc..

Do I think the business model should change? Yes, but I rather give people the choice to try the old (and in my opinion failing) business model rather than not let them try at all. After all that's what the spirit of open source is about. Choice.