Speaking for myself, I hesitate to buy these anymore because I have about 20 games from other bundles that remain untouched. Maybe I'll get around to playing a triple AAA buried in my steam list, but as time goes on I forget about the smaller games, and I know that I would just be throwing more of them up here on the pile.
This is compounded by the fact that they are running out of big names to anchor things on. The biggest anchor here is from 2009 and some of the RPG bundles have reached back much further.
Kind of a catch22 for the indies I guess, they hope to use these bundles for exposure but I'm most likely to buy bundles that have vetted games.