Depends on the project, I have never heard the one OP talked about, so I can easily say that it is going to be not that much at all, because if it was a good one, it would have been heard a long time ago, and look at how low ranked it is, that tells you everything. But if we are talking about just the general idea of earning features? Then I can tell you that it could make a lot of money for people because people like that kind of approach.
This is very important, and because of that we need to focus on how to make money with these projects at optimized levels. Most of the time just being invested in isn't enough, so that is the most important part of these projects, to be fully in and actually spending time on them.
I agree, since basically there is no point paying people to do something unproductive so also there is no point trying to attract unproductive people.
Do bear in mind though that "investors", who simply put in money and sit back expecting or even hoping other people will do all the work, can also be viewed as somewhat lacking in productivity depending I suppose on how much of an investment they initially "produce" meaning contribute, invest.
Essentially they are passive, they provide a buy-side asset with which a good strong buy-side can be built, and often do not even actually build that buy-side themselves but expect the active participants aka "team" to do it for them.
Especially when looking to "cash out": that is when they will really appreciate all the work someone put into building a good strong buy side that they can proceed to "destroy" by "dumping" on it!
This is why I try to encourage people to "invest" by building a column of buy-offers; they would thus be investing in building a good strong buy-side to help sites like CoinMarketCap and coingecko see the asset as valuable, since buy-side offers are important to such sites' evaluation of assets.
They would be more-active participants than so called "investors" who simply buy once then sit back waiting to destroy a good big chunk of hard-built buy-side by "dumping"...
By helping build a strong buy-side they help defend against such "dumpers", by hopefully building the buy-side so strong all the "dumpers" can go ahead and dump then everyone else can keep on keeping on growing the project, growing the asset(s), building the buy-sides higher...
-MarkM-