Recruiters: please do this
giantrobotbattle.com
giantrobotbattle.com
I also refuse to spam. As such, I'm still trying to figure out a good strategy for finding quality candidates. Some people in my field think that this is just a numbers game, but I really hope it isn't because if it is, then spams like the one you describe are completely justifiable.
I recently posted about this very problem to HN, and I would love your thoughts.