JSquared2 said: "A "past dated" ticket has no monetary value, since there's no guarantee the buyer can ever use it. If you don't want it to go to waste, then just give it away to someone. Or at the very least, do the exchange yourself and then put an actual confirmed ticket up for sale."
Yup.
"When the audience comes in, it changes the temperature of what you've written." -Stephen Sondheim