You can't just "buy exotics"--you can choose from a limited selection for a 48 hour period each week. And there are plenty of "exclusive" exotics--obtained from raiding or exotic bounties--such that the ones for sale are not the "rarest of the rare" (heck--I'd argue that some of the Raid legendaries are more rare than some of the exotics). Strange Coins aren't any easier to obtain than anything else in this game, especially for players incapable of completing the Weekly Heroic on level 28. Outside of these 3 - 9 coins per week per character, you need a blue or better engram to even have a chance of obtaining one, so I'm really not sure what your point is, other than complaining about others getting to enjoy awesome weapons, too...