I tried another Korean Server and this Time, it shows for me here with a Germany based Postal Address:
Preload: November 14 - 06:00 AM
Available = Playable: November 17 - 04:00 PM
This time the Korean Server thing worked. Last time it showed November 18 06:00 AM still.
Anyway:
Short answer: No need to use a VPN every Time. When the Game is activated, it is activated.
Long answer:
There are a dozen of Descriptions in the Net. And here is the Link again which Burricho already posted:
http://www.reddit.co...titanfall_early
I have never Pre-Ordered and Preloaded a Game on Origin my self yet, but it works basically on all Platforms the same way.
And the Description above is for Origin itself.
So basically:
Make sure yor are Logged out of Origin (and the Website if you visit it before) and close Origin completely.
How to Preload:
1.) Connect to a Korean VPN Server
2.) Start the Origin Software and Login like always
3.) Start the Preload of #WhateverGame
At this point, the Description says you can pause the DL and disconnect from the Korean VPN, when Origin has been loaded around 20 Megabyte
Other People had more luck after 100 - 200 Megabyte were done. Unpause the Download. UPDATE: 15.11.2014: Do not pause the Download. It does not work for everyone. Simply disconnect from the VPN and 10-60 Seconds later, you should get the maximum Download Speed from your ISP.
5.) Wait until the Download is complete
6.) Logout of Origin
Preload done.
You can start Origin without a VPN Connection anytime you want, if you want to play / download another Game.
Personally, at this Point I will make a Full Copy / Full Backup of the Preloaded Game just in case the DRM Software "has her days" 
How to Play:
At the official Release Date and Time:
1.) Connect to a Korean VPN Server
2.) Start the Origin Software and Login like always
3.) Start the Game
4.) Wait until the Game has loaded up to the Main Game Menu <- Depending on your PC and ISP Speed, it could take between 60 Second and in very very rare cases up to 5 Minutes. So dont worry! Origin must Download and / or decode the Executables (the File that starts the Game).
5.) Tab-out of the Game to the Desktop. Or: If you dont want to play now, close the Game
6.) Logout of Origin
7.) Disconnect from the VPN
8.) Play the Game
9.) Happy Dragon Hunting 
You dont have to reconnect every Time through a VPN as soon as the Game has been activated the first time. Currently, the Origin Software is not able to deactivate it. !Just make sure to not use Origin or put it in Offline Mode until your local Release Date! EDIT: This is because a small case of People reported, that Origin has deleted the Game Folder. For now, its not really a forced uninstall but a Bug within Origin itself.
Who knows, maybe they will close this hole in the future. But for now you are fine.
Luckily, no Constant Internet Connection needed for DA:I.
And yes, as it actually stands, there are no known People that got banned for Preloading and Playing a Game on a different Release Date.
Buying a Game cheaper while using a VPN is another thing of course...