Well part of the issue, at least on asura, is that there are people going into sortie solo. This increases the line. If more would team up, I bet the line would be shorter. Yes it is their choice to go solo, which is fine, I'm all about freedom of choice, just that in this case it does hurt the server in general by increasing the wait times.

Everyone in party gets same drops directly, as long as they are in range. Same points for everyone, you kill more as a party so I don't see any advantage of going solo, other than you can do it on your own time, without waiting for anyone else.