Since The Taken King is out you are able to buy Coins from Xûr that increase the Drop rate for Exotic Engrams. I had around 75 of them. I used all but only got 4 Engrams. I don't understand why I don't really get anything. Is the drop rate really to low? Or am I just incredible unlucky?
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Are you using 1 at a time? Using multiples has no effect. The "stacking" occurs in the background, where each Ultra that doesn't drop adds a chance of the next dropping an exotic. In my experience the drop rate is around 10 to 15 percent.