as I understand the system, it is mostly suited for way lower level players (or rather companies). Most of the quests have a max level 12, one is 52? The max one right now always gives 5 Rubies. I guess if you dont have the max level, lets say your company is level 11, then you get a lower level daily, which gives 4 (or even less for lower even lower company level), something like that.
However, the Quests which give 5 Rubies, are the highest, at the moment there are no Dailies that give more than 5 Rubies (and quite Frankly, that its quite a lot for a F2P game if you ask me, they give really a lot of free gems in this game, hardly any reason for any sane person to spend money on this game...)