In my experience with regular (normal, novice, whatever we should call them) users, they prefer installers because they aren't sure what to do with zip files. I'm a techie, but personally I don't have a preference of installer vs. zip file. As long as an application with an installer includes a 'Custom' install option where I can choose where to install the app and select/deselect shortcuts and stuff like that, I'm happy.
Plus (if necessary for some apps, like Spiceworks for example) installers help ensure prerequisites like .Net, VC++ redistributables, Ruby, PHP, Python, certain necessary patches, etc are installed. Nothing worse than trying to run an app and find out you need to download and install something to make it actually run. 
Dr. Apps
Software Community Guru
OpenCandy
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-drapps
I am sorry but that is not an answer to my worry. I mentioned that because of your venture will force more developers to use installers when they do not need to. You are making it as if like installers are needed and necessary. They are not necessary in half of the cases. Without installers your whole idea of OC fails unless you force them to integrate into their application which will be a worse case.
If O'Reilly is investing in exploitation of spam technologies, I would stop buying their products as well. No big deal.
I also do not think that those Divx guys learned their lessons. They might ask for a second chance but I am not seeing them being any further than they were back then. It seems like they are just adapting themselves and have not moved an inch forward and no salvation there.
I just do not see OC being any good or bringing anything good. This is no different than getting a spam call in the middle of a dinner, you know that is when they call you.
I might be entitled to my opinions but I can educate-convince quite a lot of people. I know that is what you are addressing here, but you have a very hard case to sell to be honest.