Have you ever kept a key/gift for a more meaningful giveaway, only to have it become ungiftable?

I don't keep anything, just creating giveaways as soon as possible. Probably why I don't make any kinds of events or celebrate stuff, unless there happens to be a sale going on at the same time.

I kept some unbundled expensive games only to have it become bundled :P

Yup, I had to learn the hard way and "lost" several MMO early access steam gifts when they released the game and made it free.

yes, i have 599 keys for panoptes ;_;

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I don't have too much money but i was trying to fix my karma so i bough 5 copies of an indiegala bundle with the happy hour... I reserved them to give those keys in my cake day. 10 days later Metroid gave for free some of those games so i lost 20 keys in just one day :/

There was one recently, but I found a solution

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Yup! Well, not specific keys, but for a while I was saving up keys to do a big train and then when I went to do the train, 6 of the keys I'd saved up had been given away free in the meantime. Not a big deal as they were just little filler games in bundles anyway and I still found people who wanted them :)

My solution for useless keys is to give them to buddies if they are interested in giving the game a shot, only had a few that have become so though.

SS2 can never become useless, it is quite possibly one of the best games ever if not the best game ever. I once completed it twice in a week, I'd just finished playing through it and my daughter had caught a glimpse of some of the gameplay, pulled up a chair next to me and "forced" me to play it again so she could see all the story.

This then led to me having to play Bioshock 1,2 and 3 for her so she could watch them too.

And cheap games that neither Playblink accept?
Every day's bread...

...What happened to System Shock 2?

happens all the time because i'm too lazy to make giveaways as often as i should. ;_;

:) has happened to me quite a few times. Then i just put them in my giveaway descriptions and let whoever wants it have it. Doesn't really but me as long as someone gets some use from it.

I still have a bunch of keys for games that got added to the list as free games :S

Planned to use them for a train or make a large puzzle event, now I just give them to friends.

I always keep keys and don't give them out as soon as I buy, at least most of the time.
And yes, it happened to me that a game became bundled or non-giftable.

Kind of. I wanted to make Talos kind of the finale to an unbundled train after a difficult puzzle, it became bundled before people solved the puzzle (but after I made the GA, for a different level than the bundle train that preceded it, so it didn't fit in anywhere anymore ^^)
An I once made a GA set to start 3 hours later for an event, about half an hour before it started it was given out for free somewhere else (it was just a left over bundle game and I could replace it, but still kind of bummed me out).

So now I regularly empty out my inventories here ^^

Yes, more than a dozen times. I don't count anymore and it happened again just now with Planetary Annihilation. 5 more keys worthless, I'm seriously thinking of stopping to buy stuff for GA purposes.

ETS2 in fact. Gotta give stuff away as soon as possible.

Nope, but some games became bundled before I made a giveaway... But that's still better than nothing.