I disagree, this is more milliondollarhomepage than anything else. Sure, they could make money like the way Steam do (
http://store.steampowered.com) but not with this specific model. There is legs in the bundle model, but I don't think it requires any investment... it's a 0 capital start up, they've made their name so when they approach other indie developers they can work based on their name alone.
I would however seriously hope they don't do what you're suggesting (weekly) the idea has very limited usage, there are a finite number of games out there and a finite amount of interest, this works based on the publicity ("Viral marketing") and not just the idea. Take a look at appsumo for an idea, their bundles are crap now (compared to what I as an "early adopter" got accustomed to) and most lost interest.
This is not an idea to milk.