On what basis do you join GA's?

i enter games i want to play, not idle or +1 my library.

I joined in late June 2014:
Giveaways Entered 9,263

In the last year I've won 50 games and I've been very lucky with some of my wins, it's true, I have won some awesome games here. I stopped entering so many GAs because I used to click anything that seemed the least bit interesting or because I was giving constantly in groups and felt like I was not benefiting from being in the group so I'd enter for GAs even if I wasn't certain I'd do more than idle for cards. I no longer do that, but I also struggle to justify the expense of constantly doing mandatory monthly GAs in groups. It's a yingyang situation and to be honest lately I feel out of balance. That's usually when I take a break from SG.

What? No poll? For shame.

I only enter for games I want to play. I have over 5000 games hidden.

But, I only started that behavior over the past year. Before that I would join stuff "just because." So, i ended up with a bunch of card fodder. I did use the card money for some good games. Divinity Original Sin being one of them. But it is not worth the time nor the headache. So, I changed.

I enter games I know they are good and likely (or surely) will enjoy, I still like to try new stuff as long as there's a solid chance that I will like it. If I want a game, I enter every copy for it that's allowed (like owning 1/2 of a pack), but if there's a game that really interests me but I still have my doubts (requirements, style) I prefer to enter for public giveaways because most of the entrants very likely go for the bigger games because it has a name. If I can run it, yay, if I can't, eventually I'll still play them and I do feel that this is enough. For low entry number group/WL giveaways I tend to be more critical, I often don't enter for "just interesting" games if I know that some people would really like to get it.
So, a TLDR:
Games I'd like to play and/or try out. I'm less critical about public because low chance = like winning on a lottery, while on low entry GAs - winning it from other people if I'm just mildly interested, so I try to avoid it.

I join for games I want to play. In the case of Whitelist giveaways, I ponder extra carefully whether the game is something I will definitely be playing soon. For example https://www.steamgifts.com/giveaway/dBUKB/torment-tides-of-numenera is a game I really want, but when the creator states any kind of expectations in the description, I'd rather leave it to someone else.