Vendors should sell the specific items so you can spend your earned coinage on whatever item you are trying to get a good roll on.
its like going to drive through and throwing them $10 and having them give you whatever they want to give you. No, im here for a mcrib sandwich with extra sauce and onions, no pickle.
years ago bungie stated that players didnt like the the token system and they were cutting back on it. The problem wasn't the tokens....it was how you still had to play the -blam!-ing slot machine game with your tokens.
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should literally work like the DSC raid chest. Get to the end, turn in set amounts of tokens for a random roll on the specific item you want.