I've made a thread about that some months ago, and Instead of necro posting, I decided to create a new one, because I found a new, experimental, method:
1- Proxy vote and get like 4 Marks
2- Put 2 in bank and unstack the other 2
3- Relog
4- Take Marks from bank and make 2 stacks with 2 tokens each
5- Relog
6- Take the 2 marks that will magically appear on the bank and put one on each stack
7- Rinse and repeat a few times
8- When you get like, 20 marks, makes 3 stacks, 2 with 1 mark each and one with 18
9- Put the 18 mark in the bank
10- Relog
11- Take the 18 mark from the bank and divide it between the 2 stacks.
12- Relog
13- Repeat "11". Now you have 18+18+2 = 38
14- Make 2 stacks with 1 each and put 36 in the bank
15- Relog
16- Take 36 marks from the bank and divide them between the stacks.
17- Relog
18- Repeat "16". Now you have 36+36+2 = 74
15- Keep following the pattern until you have enough tokens to get anything you want.
Make sure to do /who sometimes and delete what's written in the bar, then press refresh to see if there's any GM next to you.
Please, If there's anything wrong in this tutorial, or if it's not working, let me know.
Old method: http://www.mmowned.com/forums/showthread.php?t=233058
EDIT:
Looks like they've fixed it already, so, it won't worky anymore, unless you've done it before, and the marks are bugged at your bank. It won't work with any new charachters, unless I've been doing something wrong, which's unlikely. Paying +1 rep if someone find an alternative way to dupe useing the bank.