Currently "Server" is the only one with more than 100K. SerialLoving had over 100K, and gave it to a family member of his as a publicity stunt. Later he bought an Admin alt from someone, which divided the money amongst 2 people, and thus no real player has over 100K. I think currently Panacea has most money (No idea how much exactly), but due to some glitch he doesn't show up on /baltop 1 when he's offline. Do /bal Panacea01 if you want to check how much money he has.
I believe, but I stress: I don't want to make any accusations, that SerialLoving received money from DedicatedRam (known scammer) and he got a large part from having loads of alts and spamming the challenges.