Scoresending on multiple newbie shells with scores that give 1,000 nps and fast times like 10 seconds for all games in the game room.
Guaranteed for having those shells frozen, that is why its a good idea to make newbie shells. Make sure you have a shell to transfer the nps to. Make sure you have a shell that is at least like old enough to make trades and make sure you use proxies, but don't send the nps to a shell you SSed on.
I would say restocking with ad-block and greasemonkey autohaggle. It makes it appear as if you are legit (since you actually have to click the item..etc), and if executed probably, an enormous profit could be made. Most autobuyers take around 3000 - 4000 ms to snipe their items (to avoid freeze). From what I've measured, using the semi-legit restocking method takes around the same amount of time.