I got my supreme by grouping on my wizard while playing another box to farm $. It let me maximize exp AND plat.You won't get a supreme by grouping unless it takes years.
As to the larger issue of players not grouping... I think one of the biggest issues here is that the most rewarding exp/$ content is not the most challenging content. IMO, one of the most foolish changes I have ever seen to the game was the nerfing of Citadel exp and $. At the time, Citadel was the most challenging exp area in the game, and it was quite rewarding in exp and $ (although not especially moreso than other areas). To do the hardest stuff in Citadel, you needed to group, and it really encouraged unboxed grouping, because there were lots of mechanics that punished boxers. After citadel got nerfed, the most rewarding places to go for both exp and $ were easy zones. Places where boxing was easy, and you didn't even need 6 characters to do kill the hardest mobs, so any incentive people had to bring along the new guy, or not box was removed.
Citadel and OG giant fungus/caves areas *should* be the most rewarding exp/cash areas in the game because they are challenging enough that they will encourage groups of 6 unboxed players to be most effective and minimize chance of death. Instead, places like kaesora are the most rewarding places in the game, where there is no incentive to unbox, or even bring a full group.
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