The blogger at willcode4beer says in 17 Thousand Reasons I’m not a Ruby on Rails Developer that the median salary of Rails developers is on average $17K less than that for J2EE developers. I’m not worried — the pay at TSOT for RoR development is on par with the J2EE rates cited.
The article also suggests that “to bring salaries up, they need to drop the ‘easy’ part. Development is hard, and no language or platform is going to change that. We solve complex problems. Complex problems are hard to solve. period. They should focus on the productivity gains in the areas where Rails shines, and try to avoid the areas where it doesn’t.”