Trust me, while you may have taken part in the glitch unknowingly or knowingly, and done some largely time consuming dailies, many others did not. They would use the fastest daily they could find, which takes maybe a minute to complete all 10 of (and it's in the lvl 80 zone, so decent xp/tp), and then they would use the glitch. Accidentally using a glitch would not have caused you to get banned, I believe, but forums is not a place for discussing bans. Support is. However, it is these people that were abusing the glitch that caused the fairly large banhammer to strike down.
Also, Gameforge does not do the programming, that is Runewaker. I'm fairly certain that they've been nudging Runewaker to fix the siege war times (as they're still messed up), dailies not resetting (cause that's happening to people randomly), as well as the daily glitch. However, I believe that in their minds, the first two are more important to push Runewaker to fix, as they affect all players equally or randomly. While, yes, the daily glitch may seem a trivial matter, but how would you feel if you didn't know of the glitch and a group of people did the glitch to get insane amounts of talent points that they didn't have even a day before?
EDIT: The double xp was announced. Look in News & Announcements under the thread title Winter Events. EDIT of the EDIT: Here's
the link to the announcement for the double xp.
"("logically knowing that it wasn't meant to be")" - Have you ever known dailies to be able to be reset without a daily reset ticket without using a glitch? I haven't, and I played during the previous daily reset glitch.