Too many to tell all of them. I DID get my treasured 1970 Ludwig Downbeat from craigslist. I bought it for $800, but after I sold off the cymbals, snare, and hardware, it ended up costing me just under $300. Best investment I ever made, even better than the Supraphonic I bought for $25, the Tama Starclassic 5-piece outfitted with 7 Ks for $550, and the 60s Ludwig Super Classic (complete with hardware, cases, cymbals) for $400.
I used to really be into the flipping game, but times have changed, at least with Portland's craigslist. Now, the deals are fewer and farther between, and buyers are willing to pay much less than they were 3 years ago. I only look on there now to try and catch the occasional unique item, and have all but stopped listing things for sale.
As for eBay, I bought a Line 6 Vetta amp in "perfect condition" years ago, only to have it show up with a display that doesn't work and have no recourse because the seller "disappeared". Lovely...