I use craig's list for many things like finding place to rent, electronics stuffs, or even their personal section. however with mounting number of spammers, Craig's list is losing its credibility. I had written to the craig's list to implement tougher rules to ban users permanently even their IP addresses if found to be spamming repeatedly. however that has not happened so far. so why is Craig's list so reluctant to implement more strict rules which will actually benefit the users?