Several years ago I had a suite coupon expire after trying to use it every week. I sadly had to throw it away. Today I would mail it back to Hyatt's customer service and ask for another one.

I fell for this scheme with Continental when I was new to the FF game and quite naive. I bought the packet of miles and upgrades for new members for $50 or $75 but each upgrade was on a "space available" basis. Since Continental will upgrade -anyone- with status above a new member holding that flimsy coupon, I asked and asked and was always sent back to my middle seat in coach. I wonder if any of those coupons have ever been redeemed...

Most upgrade coupons are worthless, and some have negative value, such as Hertz's "use this SPECIAL CODE, pay $10 more a day than the discounted rate, and get a FREE UPGRADE!"