Sounds like the L2Pass progress was shared across alts in a single account. You could just farm low level areas using low-level alts very quickly.
I like the idea of the L2Pass & think it should come back again, but it needs better & not lvl locked rewards, it needed to be another month longer, & it needed to be locked to a single character. I started about 12/07 and yesterday was about 200k points short of completing it for completing it on my main account. I was running my pc 24/7 from 12/07 to 1/12.
Glad folks were able to use tricks to complete this event. Makes it feel really worthwhile playing this game.