I could use the raid gear point again. If it dropped at 280, you would have to infuse it, before you could even use it in the game mode it dropped for! That would be extremely stupid would it not? Remember when crota's end gear dropped at a started light of +(24 or 27 I forget) you have to upgrade it, before you could even be the recommended level for the raid. Bungie saw that this was stupid, and made the started light +30, so you didn't decrease your level in equipping it. Obviously, the gear lord shax sells should not be over 280, it is vendor gear, but if I grind my brains out, get to iron banner level 5, and win a match, I should have a small chance at 300+ gear (assuming my current light level is 290.)