Recruiters. Sent off my CV for a role paying X-Y. Recruiter calls up and asks what my current/desired rate is...I say Y. He says "oh, well, I'm not sure what their budget is, and whether they'd be able to go that high."
Okay, thanks, then why bother listing it on the site with that info? And if it really means "they'll only pay Y if you totally blow them away", then just say that. Don't BS me.