Thanks, tbh I'm just throwing out ideas I have that I think would work in the game and work well. Bungie would do whatever they wanted if they used the idea anyway. But I think it would work better with 2 venders per location, one for class specific gear, like the mentors, and one for location rewards, for example, getting your grimoir filled gets you a special shader or emblem that you get for each character you have that would have a semblance of knowledge and achievement, beating certain hologram challenges gets you different weapons for the character you beat them on which would have a "freshly recovered from the wastes" look, and doing well enough in 1v1 in the Proving Grounds gets you special armor with a gladiator-esc feel to it. This is all just off the top of my head though, not sure if it sounds good or not.

Idk. I think having two each would be a little much... Also I think the activities should be more about entertainment and less able rewards. Putting rewards for the activities would turn them into chores...