Although it's worth mentioning that not all of these are games. I see tilesets, novels, etc. Still DRM free, and quite a few games that I've paid more for elsewhere. Very good value.
That's why I said "stuff" instead of just games.
In that bundle's instance the focus seems less on the content and more the idea of people involved showing their support for the causes the funds go to.
Something similar happened with Bandcamp yesterday when they waived taking cuts of any sales made through the site. A number of artists, labels and others on the site pledged their earnings over to donations to charitable causes.