"Craigslist charges for job posts in competitive markets; the posts disappear after thirty days.
I charge nothing for listings at http://www.warplife.com/jobs/computer/ and they are permanent."
Instead, your site is effectively a rolodex of companies who hire tech workers.
While this isn't useless, it's completely unlike CL. Frankly, I can see almost noone[0] spending money on a Rolodex entry. I would regard anyone who did spend money on such a thing with a huge amount of suspicion.
And, uh, I've gotten a couple of really good, solid job offers through CL jobs postings, so they were quite useful to me.
[0] "Almost", because people spend money on unreasonable things all the time.