That seems like a lot of work, time, and expense to get ones feedback to over 1100 then start scamming people. I've seen sellers who buy a lot of "best chocolate chip cookie recipe" listings at BIN for 25 cents (recipe delivered via email) to get to over 100 transactions with 100% feedback and then start ripping people off, selling counterfeit junk etc...but buying/selling to get over 1k feedback, over the course of 9 years and 9 months that they have been on eBay - that can't be right. Might have had a spate of bad luck buying, and I didn't really see where they are buying from one person and returning to someone else...not sure how you divined that from their feedback - did this buyer pull something similar on you? I mentioned it recently...because I do have a Tumblr with only about 45 followers (at least 1 of which is a SF member) and things do get reblogged and looked at a bit via Tumblr but no sales resulted as far as I know. Also have a Pinterest, zero followers, only 1 repin ever - sort of pointless for me to keep it but I'll probably still update it when work is slow or whatnot.