I routinely get cold calls from recruiters, several a month these days. It's exceptionally rarely anyone I actually want to talk to with a position I'm even slightly interested in. They're reliably talking up a "great opportunity" that offers uninspiring hourly pay on an unimpressive contract-to-hire and requires I relocate myself to somewhere I have no other reason to want to be. Probably a third to a half of them are, based on the quality of the connection and speech patterns, calling from body-shops in a much poorer country.

I strongly suspect that there's a whole industry out there running on what amounts to amortized lottery odds. Since they're working from some place where people and calls are very cheap, they just throw more cold calls at everything.