Originally posted by beattyfamily
I would also think another reason not to upgrade is that you loose the "advance purchase" of the 4 day right because you would do this upgrade down in WDW when you buy the 4-day??
Correct. The upgrade at WDW will be charged at gate prices.
Or could you buy the 4-day "advance purchase" discount and then uprade to a 5 day down at WDW with your one days and your 4 days?
I'm asking this because this is the situation for our friends coming with us. They have one day left on 4 or 5 day passes and then are also going to buy 4 day passes to make this trip a 5 day trip. I was thinking they needed to buy their 4 day pass now to get the discount of "advance purchase" and then bring their 1 day left passes and use them separately and they couldnt' combine them because they bought them before they came down.
If they upgrade any previously purchased ticket at WDW, they will lose any advance purchase discount they had on the ticket. You are correct in your theory that their best option monetarily is to use them separately. Since the old ticket only has one day left on it, it shouldn't pose much of a problem to do this.