It's tough to generate revenue that isn't through ads.

That said, if the users could organize into special interest groups and create a walled-garden with default no ads, and then gate-keep advertisers to a permitted white-list.

I dunno, I'm just spit-ballin

You want the unemployed to pay? Or do you want the employers to pay? If you want the employers to pay, how do you attract enough attractive unemployed to your site?