It also becomes a lot faster if you do multiple of character type ie 3 warlocks you multiply the rewards really fast. You can also speed things up with all three classes as sometimes things will drop for a character your not playing but shards are always useful until the raid. Also remember there are only really 3 useful pve vendor weapons so you only ever need to get to rank 3 with one of each class then buy the vanguard rep weeps and armour and be done with payrolls forever. ( you can get mats for rep from the q master ) ;) marks drop from the night fall, heroic, strikes.