While Webstyle 4 isn't quite as easy to use as we're lead to believe and tech support is spotty, I think it's great value! I've done several sites and charged good money for them. It took me 1/4 of the time and the clients are pleased. Charging extra for the templates is a no-brainer; they're cheap for what you're getting and while I haven't bought them yet, I certainly intend to.

As all web designers know, this kind of work takes a lot of time, I don't think $20US is too much to ask. In fact, I'd like to see more updates more often.