So...
-Free on Steam, Free on MegaGlest.org
-Have to rely on donations for upkeep(which will only become more demanding with more players).
+Satisfies desire to keep MG free.
+Potentially much larger player-base gains.
+Equal pricing everywhere.
-Paid on Steam, Free on MegaGlest.org
+Brings in money, pays for upkeep.
+Satisfies desire to keep MG free.
+Potentially larger player-base gains.
-Creates odd customer dynamic, by being asked to pay for a free game. (Could be rectified either with pay-what-you-want, and/or clear announcement that the game is FREE outside of Steam.)
-Paid on Both
+Brings in money, pays for upkeep.
-MG will now cost money.
-/+Lowest potential player-base gains.
+Equal pricing everywhere.
Having been a Steam member for many years, and played a lot of the free games offered, I think the idea that free games are covered in trolls is generally not true. Players are often impressed with what they can get for free, and I find it hard to believe that there's a noticeable amount of people sitting around pissing on free games 24/7. I know at least for myself, I'm much more likely to write a negative review for a game I paid for, because when I pay for something and it's bad, I actually lost something in that transaction. As opposed to a free game, I just uninstall it. There are free games with low ratings and high ratings, and I've run into many paid games with abysmal ratings. Steam's new refunding feature does help a lot on the paid game side of things.
Games like War Thunder, Planetside 2, Warframe, and Unturned have done quite well being F2P.
Regardless of the cost of the game, a small free demo offered both on and off of Steam would help players decide whether they like the game before they invest more time/money into it. Thus, making them less likely to leave a negative review if they don't like it.
Perhaps also a feedback system outside of Steam Reviews, driven by Google Forms(or something equivalent), that would allow people to express feedback without necessarily affecting the Steam rating.