There's more to it than just egos, grudges and greed..
I personally don't value money much, not in the greedy kind of way at least, if losing money is in the way of something positive happening I'm more than happy to give it away, and the other way around, I don't want your dollars if it means I have to do something against my morale(selling rares, stats, unbans, any special treatment)
For me, money or greed is not what is keeping me from teaming up
Acy: There's loyalty and trust, the way the other new server was born was through lies and backstabbing(months of planning, stolen source, continuous lies even after calling them out on it), there is no way we can go back to being a team again.
Cornflakes; The way it was ran by Pyru was horrible and greedy and that person is not someone I would want to co-operate with, best thing he ever did to Cornflakes was that he left. I have no idea about the current owner, from stalking their news, he seems very amateur but at least he is trying. In this case I'm not impressed enough.
Now, I am not saying I'm running things perfectly, I surely am not, but it isn't worth the extra drama to team up with what there is currently on the table. These people running servers currently are not shining with their skills enough for me to even consider teaming up with them. I require at least same level of skill as I do, loyalty and mental stability.