Things generally change as a whole or at least in ratios and percentages... cost of living, wage increases for performance, industry costs, and so forth. Similarly, you should "contribute" more according to the value you would have if money were involved, right?
Corruption hasn't been too high on my thought processes on it yet simply because you'd need a system to harden before you can harden it, right? But it wouldn't be too crazy. I mean, all you'd have to do is keep it from being hacked and then have safeguards in place. Like on any site where you can't rapid fire submissions, comments, or edits. Similarly, you couldn't give someone a "raise" 3 times in a year or something.
Sure, think away. Poke at it. I'd love to see it evolve into an implementable thing, start spreading the thought on it. It would make it easier, I'm sure, to get to Mars or the next star because funding becomes a thing of the past.
That's how progress is made.
Who sets the values of individual contributions? How do we prevent that from being corrupted?
I'm going to need to think about your other points a little more.