It will be time-consuming, for sure. It will take 31 days to unlock the first vendor, then another 10 to unlock the other two. However you also get 16 gold per character, per quest. So that's 1100 gold a day just doing the daily once you've unlocked them all. I spent many more days than 41 doing the Icecrown/Argent Dailys. And I think the rewards will be worth the effort.