Because the ONLY reason I do vault is to carry my noob friend so he can get exotics. He barely knows what the f he's doing!!! I can't have multiple dead people every round! Having a higher level makes up for skill, and what's the chance you're going to find a lvl30 with skill anyways? people who have played VOG back in the glory days are 32 now, or quit and have their 30 VOG armor. There's no reason for me to break my very spine carrying multiple people. One is enough, and having two people without oracle disruptor weapons makes killing Atheon way harder than it needs to be.