You forgot to mention the Collectibles board, where buying a round piece of metal adds greatly to your reputation. Even better if you use certain users as escrow, you'll get double the feedback for just for one deal! Then sell it again, and score even more positive feedback.
I do declare Mr. V. if I didn't know better I'd say you're doing some cheeky rib poking.
Oh, claiming to be Satoshi also works. I tend to remember accounts that have claimed to be Satoshi, there's actually a fair number. I also recommend picking a fight with theymos.
He didn't say he wanted a good reputation, just a reputation.