I hear you, however this is a competitive issue. It's an offense to craigslist by airbnb on craigslist, not an offence from person A to person B via craiglist. I suppose the first issue to look at is whether harvesting and then spam is against the terms of service. The content of those emails isn't genuine, Jill and Sarah aren't real people, they cannot judge the beauty of the properties they proclaim to have seen. It wouldn't be completely Winklevossing for craiglist to be pissed off.

If they turked each property one-by-one, I think that might be fair game.