Lampworking is not a common hobby/business. We are a fairly small niche and so classes on lampworking aren't so easy to come by for some people.
Tutorials allow us to learn from teachers who we may never be able to meet in person. I'm more than willing to pay for someone's expertise.
I guess if I followed the original poster's logic, I'd be giving my magazine away for free too. Since I obviously can't make beads, all I can do is write about making beads.