The ability to vault strange coins should be patched out and gear should be bound to character upon equip because people are exploiting the ability to create 3 characters of the same class and share the gear and coins among them thereby allowing them to gain more coins than designed for use with Xur and allowing them to grind for the raid 3x as much. This is an exploit. Just like the cave. Just like pushing Atheon off the cliff. They must be punished. Bungie make it so.
EDIT: LOL the amount of hate is delicious. I'm wondering how many of you complaining are people who bitch about how Xur is ruining your precious exotics yet farm like this for strange coins. Hypocrits!
2nd EDIT: I like a posters suggestion to make Strange Coins bound to the character they were earned on. This would easily solve half the issue. The other half addressing people who are doing the raid to increase their RNGesus attempts could be likely fixed with some tweaks to the rewards. Such as guaranteeing at least a minimum reward of something decent and worth their time. It seems that people feel entitled to this method because of Bungie's lackluster loot mechanics. Also, another suggestion to allow the other two character slots to be filled with only the two other classes the person doesn't already have would be nice as well.
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I fail to see how this is considered an exploit. Xur is currently the only vendor in the game who accepts strange coins as currency, and he sells different items each week. If you have three characters of the same class, there isn't much you can buy from him that can benefit you. The only item from Xur that isn't purchasable with strange coins is the Exotic helmet engram, which can only be bought with Motes of Light. And if the engram turns out to be an item that isn't suited for the three characters that you've made, it ought to be dismantled. The same can be said of the Weekly Nightfall. I have three Warlocks myself, and this week I've gotten Exotic armors that are only suitable for Titans and Hunters. Destiny isn't like other MMOs. There is no economy in this game. Players cannot trade items with one another but themselves; the gear is bound to the account. Furthermore, the vault has a limited space capacity, as you can only hold so much item in it. I enjoy collecting exotic and legendary weapons, but soon I'll run out of room to store them, and some of the guns will have to be dismantled for upgrade materials.