I'm in the "this is good" camp. Being overrun by garbage mods is a concern, but hopefully reviews and top-seller lists will help with that. A 24-hour return policy doesn't seem long enough, though; some mod issues take a while to surface.
I'm curious to see how many choose the "choose your price" model. As someone who firmly believes in supporting creators (I still buy CDs, even though Xbox Music gives me access to most music), the "choose your price" option has always appealed to me. I'm also curious to see how many modders just choose "free" to maximize their exposure.
I wonder what Valve's cut is.
Edit: If the creators only get 25%, this is bullshit. I understand that a lot of time and money goes into making the system that showcases mods and allows you to pay for them, but I'm sure that'll get recovered pretty quickly. I know it's the way things are everywhere, but it's still bullshit. Publishers get too big a cut from authors. Labels get too big a cut from musicians. Employers get too big a cut from employees who do the ACTUAL work that brings the business. Sales get too big a cut for just convincing people to buy things. None of these people would exist if not for the person actually creating or doing the work that's being sold, and yet the creator and worker get the smallest share. Everywhere. Anyways, sorry for the rant. This shit's everywhere, and it still pisses me off.