We at GUNetwork get nothing material out of it, as I've said before there's no revenue. No ads, no donations, no premium accounts, not even a cash account to wire any kind of money to. All we gain are friends, and that inspires creative modders to do more and better for each other. It's not a download hub, it's a community. We form great relationships between modders and members and that's all we've ever wanted.
We encourage proper feedback, moral support, screenshots of the mods (we always welcome screenshots and we organize screenshot contests all the time). But most of all we have a good relationship with the members. We discourage and dismiss ass-kissing and half-assed "good work" or dishonest/shallow comments. We encourage real feedback, participation, community engagement and creativity.

Most of, and some of the best of our mods are public. Some, however, are kept for those particular members who are particularly involved in the community. It's also a safe haven for those who want to release their hard worked mods in a trusting environment, and it's a way to avoid copyright suits since we don't distribute those specific ported packs openly. Any court would throw out any infringement case distributed in a closed circuit. Other times, the system is encouraging for modders who find a stable control group for their special releases, and then gain enough swing in their pitch to make even better public releases. That "swing" is gained from real feedback, from a sense of control that they gain (which assholes who steal these mods are destroying btw, damaging the modder's confidence and implicitly their willingness to share their work at all). Real feedback is always encouraged, in contrast to constant, unsubstantiated bitching and discontent as one would often find on other sites.
If you find a bug, report it in a civilized manner. If you have a suggestion for improvement, propose it in a polite, well put-together and well researched manner, and be ready to put in some work to make it happen.

See, we've noticed these shortcomings of large leeching download hubs and we built a community to prevent them. And the fact that people are stealing these mods and putting them in other places discourage overall modding and that affects you implicitly. Many of our highest valued modders have not released their best mods because they saw these leprous mod thieves claiming all credit for their own hard work. Others have quit modding altogether because of having their mods stolen in this manner, which also means they don't get to make many potentially public mods, as they would have, which all of us might have enjoyed. This is where mod thieves are damaging their own interests, shooting themselves in the collective foot of the entire user base. I've seen many potential WIP mods that have never been released because of mod stealing. I'm trying to give them a safe release area to allow those modders to remain active and creative, and to grow towards public releases, and people leaking our exclusive mods are shitting all over that. So the whole modding scene (modders and users alike) are losing because of these self-entitled thieves, and it discourages discourse between modders and the user base, their feedback, participation, which in any other domain of human activity are considered preferable to have.

We're not talking about an inability to afford payment on something, we're talking about laziness and self-entitlement. These mods were made for people who reciprocate, cooperate, participate, who help the process of creation by moral support, and that enhances productivity. Most of our members don't feel forced to stay active, but find a genuine community to participate in, to remain in, a creative output and outlet. It's about encouraging the modders for more and for better, and the users to be engaged with them and participate in the creative process more.