The line is between pros and hobbyists. To rephrase the question, why do indie game devs not ask hobbyists for art, sound, music, and voice?
They do. All the freaking time. So far as I'm aware, significantly more asset creation in indie development is done by hobbyists, generally in exchange for some degree of inclusion on the development team, than it is by professionals who often require up-front costs an indie startup can't afford. Where are you getting the idea that indie devs don't, regularly, send out calls for non-pro aid from?
*sigh* This is why I liked my original version of the question before Sergarr went and misinterpreted it. Yes, there is hobbyist work in the industry. There is also commissioned pro work. My point is, if free hobbyist work is so much better than paid pro work, why are devs still hiring pros? You'd think all the artsits and modelers and such would be out of work yet they aren't.
You clearly haven't seen how much can those professional artists half-ass their work. Like half of technology images in Civilization V were pulled from the public domain with an shitty visual effect added. And that's only the most outstanding example, there are many smaller ones where professional Big Name artists have performed much worse than comparative hobbyists, while also getting obscene money for it.
They do, it's just less noticeable because hobbyists don't ask for money and thus get less public attention. But indie game devs have certainly did so. Like with voice acting, I know at least one game which has got it's voice acting by casting a lot of hobbyists and choosing the best ones. Incidentally, they were as good as professionals at this, if not better.
So you're going to cherry pick the worst examples of pro work and the best examples of hobbyist work and still act like you're making a cogent argument? Remind me, how many complete games with significantly new assets did Bethesda manage to produce in the time that the Tamriel Rebuilt project has been running? What about all the hobbyist content on Nexus; you're really telling me that all of it is inherently better than all pro work?
Shit. Clearly, I do not exist, nor do the rest of the DFHack people or the SKSE people or the Wrye Bash people or the TES3/4/5Edit people or wierd or
BREATHE
I'm not even that into modding that isn't DF modding and I managed to get every single one of those people off the top of my head. Collaboration is the norm in these communities.
For each of the groups you've named, several more have crashed and burned when people up and left. Collaboration is the norm of the
successful communities, it is not the norm of all communities.
Case in point: How many Morrowind fan and mod download sites are still around? There's Great House Fliggerty, Slof still has her site, theelderscrolls.info, probably a couple others I'm forgetting. Oh, and Morrowind Source, now called Nexus, the one where the guy in charge thought to treat it like a business and now has employees and expenses in the neighborhood of $500k each year. How is this supposed to be an example of hobbyist work always being superior to professional work?
Clearly, a person cannot be just-for-fun and be professional at the same time. You are either good at working with other people and dead serious all the time, or you're shit at working together with other people and have a just-for-fun attitude. There clearly are no other variants possible. Clearly.
You can enjoy your work, but yes you do have to be professional about it. Case in point, my prior example about Nexus. Try telling your boss that you'd rather be doing something else so you're taking the rest of the week off and see how well that goes.
Editing my last line for more relevant examples:
Try telling your boss that you're going to...
...do the line work and he can apply the tone,
...write about ship girls instead of a grizzled sci-fi anti-hero,
...be in QC all day instead of in the sound booth,
...work on some cool feature you just thought of instead of being in QC,
...and see how well that goes.