The whole issue with OSS software is there isn't any money coming in with significant quantity to fund projects, many, many of which are fundamental to technologies we all take for granted, take the OpenSSL story for example, as alluded to in this press release when corporations got shamed for taking advantage of this project with little funding:
Now imagine if projects like this could receive real, significant ongoing funding. Maybe charity isn't right, (non profit would be a better word here I think). I see it as a net gain.
It doesn't mean it wouldn't be complicated and add more overhead to certain projects of x size though.
Please do elaborate more though if you think it would strongly result in a net negative.
But such a system would completely change the dynamics of open source, likely in undesirable ways. Keep the money out, I say.