this actually describes me down to the T!
But seriously, it's my understanding that groups like Dattebayo were responsible for creating a Anime and Manga industry in the west, which in turn made more people buy DVDs, watch the films in cinema, and being picked up for American TV distribution due to interest on the net.
So in a way, fansub group like Dattebayo is responsible for some of the succes that a show like Naruto and Bleach has had. Without anyone to sub it, most people would not have heard about it, it would have gotten to the states in much lesser amounts, and probably not have made it for TV.
And people who see/saw the show on Dattebayo, have probably in turn spent money on the net buying importanted mangas, DVDs, blu-rays, figurines, with a lot of it at insane and stupiud price because the market is not competent enough.