on my way to level 30 with psyker emporers gift popped up like 5 or 6 times.
Each time it was a grey lasgun.
i like the idea of the item vendor but at least from lvl 30 on you should get 1 item after each mission.
otherwise people with start to just log on once per hour to check for items.
just a few coins after a mission just doesn’t feel rewarding.