As much as I like to save money, I would not want to take any chances on something going wrong (the ethics part of this aside, against Disney regulations). I can't afford to pay for my tickets twice if Disney had an issue with honouring them. I would rather deal with a reputable, authorized ticket dealer and spend a little more than risk ruining a vacation, or wasting a lot of money. Sure you can leave feedback on ebay, but what does that do for you while you are standing at the gate? To me, its an additional risk to buy from a stranger. I'm sure you will hear from people who have done this, etc etc. IMHO it's not worth it.