Is pretty much useless. I got max glimmer and nothing to buy.
Upgrades aren't that frequent or costly, all the vendor stuff stopped being purchase worthy not even 10 hours into the game.
I suppose Motes as well, are useful pretty much only Xur gambles, and Speaker's Shits.
Marks are really the only currency worth a damn, followed by strange coins to get exotics.
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Use on ammo very helpful but expensive