outstandinggamer's post in Job expires in 1300 hours was marked as the answer
It has been like this in multiplayer as long as I can remember wat before 1.20 and will be like this until the create their own economy. And i don't know when that will after they say when ETS 2 is stopped being support and that could be 5 years from now or maybe never. Don't expect it to change anytime soon.
To get different jobs follow this guide(it will reset your location to your HQ but you can teleport to where you last were. : http://forum.ets2mp.com/index.php?/topic/26-Reset-Economy-for-Jobs