As it's my season ticket, if I can't sell it, even at a discount, I usually just let it go to waste. Not worth the hassle of meeting someone, then worrying about them posting it back otherwise.
The Ticket Exchange is crap - costs you 10%, and is only available after games have otherwise sold out, which happens later and later. The villa game only sold out a day before, and my ticket didn't sell in the time it was available for.