in phase 3 (when you've turned in both 150 mark quests and picked up all three 125 mark quests), you should be earning a total of 26 marks per day.
i tested this with the shadow warden set of dailies and this is correct. it should also be the correct number for the druids of the talon set of dailies, but i'll test it out tomorrow.
for phase 3.5 and onward, here are the possible routes you can take:
- completing calling the ancients** unlocks a new daily that awards 3 marks per daynote that only the first and last quests (the ones marked with a **) unlock vendors that sell the two new pets, the crimson lasher and hyjal bear cub. to have a shot at the searing scorchling, you'll have to turn in all three quests.
- completing additional armaments unlocks
21 new daily that awards 42 marks total per day (edited: see comments below for an update on progression)
- completing filling the moonwell** unlocks a quest (no daily) that awards a one time lump sum of 10 marks
at the very end of this entire adventure (when you've turned in all three 125 mark quests), you should be earning about 30 marks per day more or less. just enough to purchase zen'vorka's cache for a shot at the scorchling companion.
the great thing about these vendors besides the pets? almost all items sold by the vendors cost gold, so any marks earned after unlocking all three vendors will pretty much be useless unless you want to purchase your faction's main city reputation tokens (such as stormwind, darnassus, etc). aaaa~and because everything else will cost gold, you can buy the cache without any guilt or reservations. just keep doing those dailies!