Because most of the people who play the iron banner are: 1: High levels who got totally -blam!-ed over by bungie when they decided to take the "Iron Banner" out of the Iron Banner and replace it with Crucible Control playlist with rep for a specific faction IF you win. Making it a complete screw over once you realize that level 8 is running around shotgun/melee spamming his way to a 4+ kdr against level 28-30's 2: People trying to actually EARN rep for the Iron banner, not get screwed over by how absolutely terrible and downright almost unplayable PvP is with how retarded the balancing(or lack thereof) is. You only earn rep if you win in the iron banner, so they leave and try to join a different lobby as to not waste their time with a losing game and actually rank up the faction instead. 3: Recently rage quit a game because of how bad a cluster -blam!- it was with the enemy team spamming everything that is the-next-level of overpowered and/or camping harder than living at a campground 24/7 365 days a year. They came back and the first game they get put into is a team that isn't even trying to win by the seems of it, rather suiciding into the enemy in human/exo/emo-homosexual-flamboyantly stupid awoken waves. They rage quit again. 4: They are not in the mood for shotgun/melee spamming skrubz and rage quit again. Srsly if your only tactic in pvp is to spam overpowered crap you need to git gud. I pull out a shotgun in close range combat sure. I melee if close combat sure. But running around with a shotgun out 90% of the game spamming slides and halo jumps so you can shotgun/melee spam everything just makes you look like a skrublord. Especially since it doesn't mean jack shit when the rewards are handed out how good you did that game. Thanks bungie. 5.They keep watching utter scrubs with negative kdr win exotic weapons because bungie has "fixed" the reward system(Destiny seems to be being built on a tower of lies now hasn't it?). I've seen 4 exotic weapons in the past 2 days get handed out to people who have below 0.47 KDR(That was the highest I recorded ffs). I won Timur's Lash after dominating a game and getting up to a 13 kill streak, but jesus -blam!- I'm just going to get 0.0 kdr for all future games with how terrible the reward system is at this rate. Timur's lash actually sucks pretty hard. Those are just some of quite possible many reasons.