This topic was originally about my stupid idea of microtransactions for exotics and Pikes/Interceptors. I got a lot of negative feedback, so... TOPIC CHANGE!
Here's an idea: if Xur is selling something you already have or don't want, he can sell two extra pieces for 2-3x it's normal price. For example, if he's selling No Land Beyond for 17 coins, you could buy a Universal Remote or Hard Light for 34-51 and 42-63 coins, if you're really desperate for it.
And it's not only for guns, for armour too.
-
The only micro-transaction they should ever consider is one that allows players to buy items of a cosmetic purpose, for instance you could create your own shades and purchase it to use in game. This would then allow for players to truly be unique without having any effect on the core of the game...