Doing freestuff is a good way to establish your reputation and get potential customers on your side.

Put bluntly, it's good PR if you later decide to sell stuff.  People will say, "Hey, he's that really cool guy who gives away some very nice stuff.  If they're his freebies, the paid for stuff must be exceptional".  Plus, if you're a newcomer to the scene, people will always be wary of buying stuff.  There have been too many scam artists, thieves and plain idiots selling ripped off and/or crappy products for people to want to take a risk.  They want to see evidence that you know what you're doing.

I don't advocate giving the moon on a stick, rather a reasonable representation of what you do but in such a way that you can justify selling other content later.

Like many have said, if you've made it already, you may as well sell it.  You'll not become a millionaire off it but you may get something back for the time taken and - at least - help towards making it a paying hobby. 

Coppula eam se non posit acceptera jocularum.

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