Hi,
This is of course my own opinion, but I don't see anything wrong in selling actions for playmaker. It doesn't steal anything from playmaker, the api is clear, all actions are open sourced and Hutongs is encouraging the built of new modified actions ( of course you'd have to be carefully about rip offs actions, but that's not the point here I think, let's assume we're all on a positive trend). I would actually consider such package if the content really worth it, like a proper full blow integration of ezgui and SM2 with playmaker, iGUI, network, user input management, prefabs, high level components, etc etc. That sure takes a lot of time to do, so if someone has spent the time to carefully craft an action library, I think it has its place in the asset store or somewhere.
Bye,
Jean