To clarify on Asteroids Deluxe: it is impossible to leech. In fact, Asteroids Deluxe was the first game deisgned to prevent leeching. The programmers wanted revenge on all the people who saucer hunted in Asteroids.(posted 9235 days ago)The saucers intentionally shoot at rocks, so you can't just leave rocks hanging for hours on end while you kill saucers.
Having said all that, I'll doubt we will make it that far down the list.