yeah!!! I did that two years ago, but then last year ended up buying 7 day tickets and using them instead, so I still have the 10 day tickets to use for this years trip!
We've bought the 10 day non-expiring tix with the water park/fun passes a few times. We find we can stretch them out and get 3 trips out of them - using up the last of one set on our upcoming trip in August.
It is a little expen$ive to buy 5 all at once (ouch!)....I open the credit card bill and suddenly feel sick .
On our last trip in Nov '09, I bought 3 10-day non-expiring passes for myself, wife and son. We had an old ticket that I thought might have 1 day left on it, so I took it to GS to check. While I was at it I also had them check a ticket my son had used and I thought was spent, but I figured what the heck I'll check anyway. Well, to my surprise, my ticket had 4 days left and my son's had, gulp, 7 days left.(How that happened, I'll never know cause I usually am up on those things. Getting old, I guess). It was like finding a big ole wad of cash. So, now we have a 2 ticket head start on our next trip, plus 3 days on son's ticket.