FODA, I appreciate it that you allow others to redistribute and sell your movies, but you can only speak for yourself. Whether it's someone's hobby or serious work is irrelevant, you still have copyright to your material. And publishing something on the Net doesn't make you lose any of your rights. If you decide to upload something you've made you have copyright to that material and you can set the rules (except regarding fair use): if the licence agreement (or readme.txt) says that redistribution is prohibited then no one who doesn't have your permission has the right to redistribute the material, for free or commercially. Well, of course if you upload it to a p2p network it's different, but even then you most certainly can prohibit commercial use.
The term "fair use" cause a lot of confusion. Fair use is private and personal use, which means that you can do almost whatever you want with the material you've bought or downloaded, at your home. Redistribution is not fair use.
So grassmunk, please sell only the movies you are permitted to sell.