Your salary expectations are awful high for a telecommute position. Next time you could consider letting them warm up to you before throwing that out. Also, how can you have expertise in "a bunch of other stuff"? The point of expertise is focus. Maybe the 40/50 are reading your email. How do you know they are not deciding up front that you're not the right fit?
I don't know where this assumption is coming from, The author is a senior ROR developer, which is very hot in the market, almost as hot as JavaScript, I earned 220k last year, all remote, doing hot technologies. Given his ROR experience $115k is a bargain whether remote or on-site. I am beginning to suspect a lot of people are underselling themselves in the market given the responses to the compensation amount.
Are these short or long term contracts? Or a permanent position?