Interesting discussion, but the whole money thing is the wrong angle here.
- The AAA games are a product of the industry and have a monetarily value that is supposed to be bigger then the investment.
- High end Indy games are mostly a product of artist doing it out of passion, but trying to live from it.
- Low end Indy games are mostly created by hobbyists accidentally creating something sellable, but doing it for fun next to their day job.
- The open source games games are generally made by students doing it for school to gain some experience and to have some fun.
- Erotic games are mostly created by geeks and LGTB to get their freak on. (And I mean that in a positive way)
People have more motivations then money for making games.
Besides money can spoil motivation by some Psychological effects.
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"Extrinsic motivators (rewards) tend to reduce
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(people's interest in, or commitment to, what they're doing)."
People that have been led to see their task not as something desirable in its own right, but as a means to an end, something you have to slog through to get the payoff.
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"Not only this but rewards are dangerous for another reason: because they remind us of obligations, of being made to do things we don’t want to do."
What I think should be done about abandoned games
Teamwork
Teamwork means that you are not just accountable to your fans or patrons, but to your team mates and don't want to let them down.
If someone has to quit, because life happens, there is still someone left to continue the game.
Planning
Planning is part of process quality. Planning a software project is hard and a game is even harder. It does however facilitate a team and other stakeholders.
Simply by writing down what has to be done creates a shared vision for everybody interested. If somebody abandons the game It can be picked up by somebody else even if the person abandoning it can't give any information anymore.
I consider an outline of a story also as planning, since the story has to be developed further.
Attitude
Game making is hard. Difficult games like roguelikes are played by people who think hard things are fun. That's not for everybody. The SEAL's only need a few good man. There is no shame in quitting a game.
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Few can finish a game even less can make a living from it. It's rare to make a living from it and still have fun.
The key is to make it fun for everybody. Keep it that way and the results will come. Keep it up long enough and the game will be done.