I'm sure you know it but there's already a GameMaker Marketplace where you can sell your scripts and engines.
I don't think there's a need to crowdfund this. I'd get it to a stable beta and release it as a demo or a base engine and use the sales from that to continue to work on it.
edit: unless you're talking about making a point and click creation studio using gamemaker as the backend, in which case yeah that might be something you'd want to crowdfund. If you're just looking to sell your GML scripts and/or your .gmx file then the marketplace is the way to go.
There's been a lot of good engines that have done well at the $10 price point on there.
I don't think there's a need to crowdfund this. I'd get it to a stable beta and release it as a demo or a base engine and use the sales from that to continue to work on it.
edit: unless you're talking about making a point and click creation studio using gamemaker as the backend, in which case yeah that might be something you'd want to crowdfund. If you're just looking to sell your GML scripts and/or your .gmx file then the marketplace is the way to go.
There's been a lot of good engines that have done well at the $10 price point on there.