I don't think the op meant Gas Town itself (if they did, my bad), but what has Yegge done with Gas Town? By now it should have released some amazing thing if Gas Town increases productivity so much.
I think the main thing he's produced using Gas Town is Gas Town itself.
What has Yegge done with Gas Town? Well for one, he has posted a bunch of blog content about it which has generated chatter like this and increased his geek mindshare.
Just because he's operating in the realm of smart nerds doesn't mean he is immune to the value-inverting effects of social media.