I'm in the same boat as arachnid. Learned a massive amount of info from forums, videos, and search engines and completed a good dozen bows before ever buying any of the popular bowyers' literature. The Internet is a beautiful tool. I feel like it's progressed the overall knowledge and information accessibility of mankind more than any other time in history.
I feel like another factor is the cheap and available tools. I don't know how it was back in the day, but you can walk into almost any department store, home improvement store, or tool store and leave with a bag of everything you need to whip out presentable bows for well under a hundred bucks. It's essentially a one time investment that opens up this art to many who are financially pressed and might not otherwise be able to afford it.