Recruiters generally aren't interested in you at any advertised rate, or even for any particular skill. They just see Java (substitute as necessary) and contracter in the general vicinity of each other and decide to call you up and smooch you, even if the job is not a good fit and pays half what you charge. Problem is, you often have to keep in touch with recruiters to keep the flow of work, so you can't just cut them off entirely.
Burner phones and email addresses for recruiters is certainly a thing, though.
When I was doing contract from 2004-2007, a shit Nokia and an O2 PAYG phone was a good investment. Many times did I just chuck the thing in the bin.
Recruiters will suck up to you even if you've ignored them for months. Commission vampires - that's all they are. You're just a line in a spreadsheet to them.
Burner phones and email addresses for recruiters is certainly a thing, though.