Why should people pay for FOSS? Isn't entire point it being free, developed for personal use and shared?
The "free" in "Free and Open Source Software" is free as in speech, not free as in beer. We'd like to think that decision to charge or not charge for the product is orthogonal to the decision to make the source code available. In practice there is some interrelation.
But FOSS was never "you can't charge for it."