If there are volunteers doing this work (unpaid ?) - what are you using this money for ?

Just for infrastructure ? If not, how do you get paid ? And how many percent of the developers get paid ? Who makes the decision who gets paid and who doesn't get paid ?

I am just interested how something like this is done in an open source project. I've seen some other projects (not programming related) which got really complicated and ruined, because they got money and started "distributing" wealth which left some of the people disgruntled (basically most of the bands who got successful have stories like that).