I fear that this is not the question. Apparently Mods WILL be linked to money in the near future. The question is, who pays the prize and who gets the money. Currently BI is trying to let players pay the prize and BI put most of it in their pocket.
Some mods need financial support. Read 1
??? Currently it is illegal to sell a mod for arma. That makes it very easy to reuse and modify other peoples work. Everything is shared and this helped to build a strong community. That is how we got to the state we are now. Read point 5