Actually there are many ppl those whom click the google advertisement I'm one of them ,some links often catch the eye,I cann't wait,then click them all to find out beyond them.Concerning the ad revenue I think it can meet the spending but generally it depends on how your site promotion is.
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There are those that offer free hosting for their community, others do it for the revenue and then there are those that just wants to build up a customer base for free hosting then eventually expand to paid services or just sell the company altogether. (One i remember being very popular back in the days was netfirms and homestead)
It's not an easy thing to accomplish but then again there are always obstacles in your way for anything you do.
Take a look at www.freewebspace.net and freewebhostingtalk.com
There are many listed there and probably some are quite successful.
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