MSEA Ver0.86 Patch Notes

[EXP distribution formula for Party Revised!]
New distribution formula will be implemented in Version 0.86 to prevent leeching of EXP among party members in MapleStory.

lol Why would anyone want to party now?

You still get increased exp in a party as far as I know, and you still have the buffs from partymembers. What this make sure of, is that exp can never be better hanging on a rope at a popular leechmap than hunting yourself. you simply get a smaller cut from the partykills and give less exp to the party from your own kills.