Interesting, has carsabi partnered with Craigslist? I always thought Craigslist didn't like scrapers and did their best to discourage and prevent them.
Yep - Craigslist does not allow scraping and blocks IPs sucking up content. Even AirBnB created their initial listings by scraping Craigslist though. Guess you can do it until they notice - and hopefully by then you have enough traffic of your own.