There's way too much spamming and phishing and scamming on Craigslist. Craig Newmark's business sense got him to a certain level of trust among consumers which helped grow the site, but now he has a responsibility to them now to honor that trust and invest in _protecting_ them.
Otherwise, the Craigslist empire's days are surely numbered.
People like Craig always seem (seem, since I don't have a wormhole into his brain) to have this moralistic I-am-not-for-profit attitude. Does it ever occur to his, seriously, that every single entity posting on his site is ravenously trying to make the greatest/easiest/cheapest possible buck? ...and that he is facilitating that immoral attitude?
Otherwise, the Craigslist empire's days are surely numbered.