Other techniques for getting paid what you're worth: give headhunters different numbers. That way you can search for the really lucrative jobs without cutting yourself off completely. I use a complex formula based on the following factors:

• Did the recruiter follow my contact instructions?
• How annoying is he?
  
• How frustrating was work today?
  
• How much time did I waste in traffic?
• How aghast is he that I insist on knowing the non-monetary compensation offered before I list a monetary wage?
• How many recruiters have I talked to today?
• How bad are my allergies?
• Did my cat do something adorable today?

It seems to work fairly well, although to be fair the really high quotes haven't produced anything yet.