Not sure if this has been posted before but discovered it the other day on my own.... sort of an exploit, but more of a manipulation of access.
Everone knows the credit card exploit where you can use a no longer active credit card to get free play time... however, lately its been harder to do that (I've found that I need no longer active two credit cards to make it work now which I don't have) so if you don't want to go through the hassle of playing credit card fraud and on top of that pay the 25 dollars EVERY month for 4 extra slots heres how to get around that.
All you need to do is register for the station pass in order to get the four extra slots one month, create four characters, then cancel that station pass and go back to the regular 15 dollar 6 character subscription.
When you are at character select, you will notice that you only see 6 of the toons... the other four that are on the account aren't listed and you might think they are gone or unobtainable... but here is how to access them. Say you have 10 characters
These following 6 are on the character select screen after you switch back to the 14 dollar 6 slot plan:
1)Bob
2)Ed
3)George
4)Fred
5)Larry
6)Frank
The next 4 that you have on your account you don't see because they were taken off from the character select... thus supposed no access.
7)Nancy
Janet
9)Barb
10)Francis
Now say you wish to play Nancy but you can't select her to play because she is hidden and is only supposed to be playable if you have the station pass for the 10 character slots... here is what you do
1) Log in any of your 6 available toons... for example Fred
2) type /camp Nancy
easy as that, Fred will camp out and Nancy will zone in now you have access to one of your hidden characters!!!
Enjoy!