Hi,
I think it's actually very good that you can find custom actions for PlayMaker as paid assets on the asset store. Just like anything else, it's a tool, and if it is useful as a tool then it has a value to your project. There is indeed a lot of work being writing custom actions, even if it seems not to be the case. Custom actions have the right to be charged for ( and $15 is indeed very affordable). Fair enough paid custom actions for Unity's own feature "could" be seen as pushing, even tho again nothing wrong with someone coming up with a fantastic set of custom action for Mecanim or the soon to come 2d GUI, etc etc.
I am actually very thankful that a lot of members are releasing more and more custom actions. It's really great to see this becoming the norm, and I really hope they sell well for the paid ones.
The current problem the wiki is facing is time allocation ( read money) to maintain the vast volume of "free" custom actions. With Paid custom actions, you can expect a different level of support, which makes sense and will be profitable both for the author and the developer using these custom actions.
You have indeed the choice not to pay the $15 and learn how to script. Custom Actions are totally open, they don't require advanced scripting knowledge, and we are here to help you get along with this. So if you decide, even as a pure artist, to dive into creating your custom actions, don't hesitate to search on the forum for existing tips, as well as ( the best way) study existing actions, and copy paste...
Last point, and a very important one. There is no rules nor expectations to have that once someone created a custom action, you can't do your own version, improve it or use it as a base to do another similar action ( provide you comply with any license that can be applied to that script). Fair enough, you can't simply copy paste as is and resell it, but if someone has some ideas on a different take for leanTween actions, it's perfectly acceptable to release them, sell them, and advertize for it ( don't high jack threads tho) on the playMaker forum. It's already the case with many assets ( in app purchases, ngui comes to mind), and that's very good, it gives people the choice.
Bye,
Jean