Sounds like all the more reason for guilds to make sure they have an internal supply.
I'm pretty sure the game isn't (and shouldn't be) designed around people playing on multiple servers. Players that choose to do so should be prepared to accept that certain compromises will likely have to be made and that fulfilling every single quest is liable to be problematic.
Daily quests are a whole different can of worms and not really the subject of this thread. However, I do agree with you that the inclusion of certain adventures as daily quests, which are tricky to do quickly for the vast majority of players, is not particularly well thought out. However, the introduction of Weak Point Potions and Ranged Support does mean DB can now be done in a matter of minutes without losing a single troop, so that is not the best example of this. Bottom line: You can easily pass up any DQs that you don't feel able to accomplish.