BrandeX: Bundle or not doesn't matter so much. I just gave away a non-bundle game and only had 1 entry. This group is just "slow" is all. There are probably not many active people.
dedoporno: I also wouldn't say it's bundle vs non-bundle. I'd say it's about more vs less desirable titles. It doesn't even matter if the game is AAA or it isn't. If people would like to play it they will join, if not - they will probably stay away and leave the chance to someone who is interested. Even more so if they are wary of their balance. In some cases only a handful of people are interested enough to join, regardless of whether they actually want to play the game or just swipe a free game because it's free and that is when you get very few or even no entries at all.
Yep, I also believe this is pretty much the case.
Personally, I don't remember when was the last time a game from my wishlist pop-up on SteamGifts and had this group stamp over it. But that's mainly because I keep my wishlist super tight as I'm only interested in games I genuinely intend to play at some time.
Makes me happy to see the group is still operative and hope it will be for a very long time, no matter how fast the sharing love flows. :)