This is exactly what I want to see, those people are not greedy, they're smart. In fact they has been enlighten and choose the right path. There is nothing good when all strong players join the same groups, it's make the server boring and lead to many negative things because people outside that 1st group will just quit.
There is nothing to be sad about, this is where the game getting more interesting. Top up some cash (or you know it's more fun when you put more effort into the game than spend money) and crush them, make some grudges. The game is boring af with hoarding players and no grudges between groups.