[chc]

This particular criterion has the benefit of helping you filter out about half of the job listings on Craigslist all on its own.

[reinhardt]

Only half? For Craigslist this sounds on the low side.

[chc]

Heh, I'm sure it depends on your market. Here I'd say it's 50% obvious jokers, 49.5% who could be all right (but could just be less obvious jokers) and 0.5% who really sound like good clients.