There's certainly no reason to, but the brilliance of the model is that you repay open source generosity in kind with a killer tool. Naturally open source deve

There's certainly no reason to, but the brilliance of the model is that you repay open source generosity in kind with a killer tool. Naturally open source developers also tend to have day jobs, and then which commercial option do you think they'll be pushing for in all those companies? Of course it only works because the product is brilliant, and the product is only brilliant because it was created by open source developers scratching their own itch. I don't think the lessons really apply to the wider web.