Good discussion. I agree with your sentiment, goodwill is very fleeting and shouldn't be taken for granted.
To stay motivated with challenging projects you need clear rewards in sight. If the rewards you expect to get from the project itself is unclear for some reason (could be due to scope, long timescale, not knowing what to expect etc.) you need to get something out of the work itself. Very often that comes from the goodwill of the people you work with. When you know that you'll get something back from the work, you'll likely enjoy the work more and do the work better.
If you feel that you aren't getting any value back from the hard work you're doing - you'll likely quit doing the work soon. Goodwill is one of the best ways to provide and get value when the monetary value isn't there yet.
When you start to receive and give monetary value in exchange for work and participation, goodwill isn't strictly necessary anymore, but it's always positive to have.
The best way to keep people motivated to do awesome work is to give them as much value back in exchange for their work as possible. Value can come in many forms like
1. direct monetary value (salary)
2. expected/possible future return (mainly monetary, possibly fame)
3. goodwill (expectation of return of favors)
4. knowledge and personal growth (if they feel that participating makes them better people, they'll enjoy it)
6. many others
When you can provide a ton of value in return for working with you, people will of course enjoy working with you way more and in turn This is actually true for other things in life too, like social events.
If you can provide a lot of value then people will likely provide you with an equal of value back.
Anyway, I love your videos, your passion comes across a lot clearer than it's even possible to do through text. Keep making videos like this!
However, it would be great if you could invest in a microphone. The audio is unfortunately almost painful to listen to, which is a shame considering the quality of the content.
The Zoom H1 is a great option. It's small and very light, cheap (below $100) and it has great audio quality. Syncing the video from the camera with the audio from the recorder is a snap too. By buying a cheap lavalier (clip-on) mic like the Audio-Technica ATR-3350 for $25 you can record yourself everywhere (would have been great for the Cathay Pacific video for example) without the annoying background noise and hiss you get with the integrated mic in the camera.