Time, effort, energy is spent going into these excellent modifications, and everyone should contribute historically, monetarily, somehow, to get a mod done.
Mods are not professional projects. Most experienced modders that I know will get the most kick of developing the mod and not so much having it completed and enjoying it. They are modding because they have the urge to create something and in my opinion it is their own responsiblity to take care of wether it gets finished or not. It should never become a burden for someone else.

Mods do not need to be contributed financially. There is no cost involved and if a program does need be purchased, well, every hobby costs money. Some modders may want to purchase a website, but that is a personal choice and not necessary for the completion or distribution of a mod.

I like it how at the Org (I don't visit other sites much) there is a still the habit of sharing discoveries. If money was to be getting involved (ie the best mod with the most unique features will get the most constributions) then I fear that people will hold their mouth. And that is certainly not to the benefit of anyone.