Back in 2003/2004, I had 10 tickets (through work, we had a work party at DLR) that I wanted to combine into four APs.
Disney wouldn't do it then. So I sold the other six for cost (back when it was $35-45 for the ticket but the group rate was $25-35 and Disney didn't do park hoppers) so I sold them to people who were waiting on line to buy tickets. Walked them through the turnstiles to make sure they worked (for their comfort). Probably wasn't a good idea to sell on property, lol but we did the same with magic mountain tickets a few years prior.