I initially got a number of recruiters. I think they scrape the ruby/rails-users mailing lists and send out spam. I'm also on every Rails job association I can find, and in the RoR LinkedIn list, etc.
I've stated my rate to contractors and tell them I want a 40hr/week remote paying the same with same benefits I have now or enough extra to pay them, and they don't talk to me again.
For senior Rails devs, I've been told (by http://mirrorplacement.com) there are periodically 120k/year USD to manage and dev team lead (close to a SF-area rate) for easily 50-65 hours a week. That's like 73-96k if it were a 40hr rate which isn't that good for a mid-level developer in SF, which is where a few of those positions' companies were based. For remote senior dev who can't work those hours easily, but need that rate to jump, it won't work.
If I contracted and managed my own projects, I could make more, but I don't have the time for that. It is a matter of rate and how much time I want to be spending. I'd like a Rails contracting agency that needs 40hr/week remote developers and will pay them >100k/year + reasonable family benefits and is flexible with time. That isn't common.