Do you Sherpa for newcomers and those less experienced? If so, many kudos.
I happened to be patrolling on Venus for a bounty when I saw a group trying to fight their way into the Vault. I immediately posted up near the left sync plate and spent the next 3-4 minutes blowing Praetorians into next week as best I could. Oddly, not one of the Vault contestants even stopped to return my wave/salutes, but I didn't mind. I love just being able to help.
I've only run the Vault twice (normal both) BTW, and only once end to end. I hope to eventually get good enough at it to Sherpa for others.
The reason i've not completed it on hard is because i'm forever 29, thanks to RNG shafting me every week by only giving me chatterwhite and shards. I would have a go at level 29 only, but that would mean finding a new raid group, easier said than done.
I've done it enough that I don't have to do it anymore if I don't want to. Titan and Warlock at 30 with full raid gear. I've got a hunter at lvl 28 that I don't really care about.
Only thing I'm missing from hard raid is preatorian foil, which I can live without. I'm done dealing with teammates that can't handle the atheon fight.