Xur sells something useful every now and then that makes raiding and striking a lot easier. I guess that's a bad thing?! Were supposed to look at xur's wares and say, "oh I can't buy it...I must earn it instead. I can't piss off these a-holes I never play with." I swear its a double edged sword. We can't buy exotics and we can't get into raid or strike parties without them.