There's a group of pranksters trying to convince players that there are upgrades and achievements associated with climbing up and down ladders. They even have a group. The only clue as to the bogosity of this supposed royal road to great iMG bonuses is the ";-)" in the group description.
Just putting this out there lest some new players feel scammed. I don't think there's any nefarious intent here, but it's potentially deceptive and certainly not the most productive use of game time for new players.
Just sayin'.