Okay i only just thought of this right now, and i apologise if its been posted already.
Basically if you have the patients to do this, it could work well.
Firstly you cancel your subscription to warcraft and wait until theres a day or two left of playing time and put your character up for trade.
When you finally get someone to trade with, you explain to them that theres no time left on the account and if they're willing to pay to reactivate it.
They say "yeh sure bla bla bla". Once you've done that you tell them that you'd like to have a day where you can play their character but not swap emails just yet but you definatly want to trade with them.
Ofcourse they're going to want to play your character so hopefully they buy a month of subscription.
and there you go, i havnt tried it out myself but it could work...
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