The strange coins are a joke, they are given out like candy. I personally have 237 in my vault and I have only run it on two characters every few weeks, anyone who has been playing this game for a while has plenty of strange coins. They are used to purchase welfare exotics from xur, but if everyone has 200+ strange coins then how is paying 13 for a gjallarhorn "earning it? I've run nightfalls weekly since release and I only just recently got mine, I didn't buy it, I earned it.