Nothing about the GPLv2 or any other version of the GPL prevents anyone from selling software that uses it as a license.

The only implication of the GPL is that, according to conventional economics, the "natural price point" is zero, since in theory anybody can sell it for less than you, and anybody else can sell it for less than them, and so on, all the way down to zero. And yet ... it doesn't work like that.

The bigger problem with the GPL isn't that it isn't (or wasn't)clear)that it can ever be compatible with Apple's app store terms.

But there is absolutely no problem getting paid for GPL (v2 or whatever) software.