I think everyone knows having to pay 200$ for f fly is insanely unbalanced. It gives factions with high donators insane advantages, and should be changed.
I was the only donator in my faction and I only had the donator rank to be able to mine spawners. We had ftop #1 for a month or two in the middle of the map, but that doesn't change the fact of how painful the basebuilding was. The majority of my time on the server was spent swimming, scaffolding etc., while the top factions could finish their base in a day or two with f fly. Im sure making f fly available for everyone would be beneficial to 90% of the servers player base, and also bring new players/make new players stay on the server.
As I see it there are 4 solutions;
Give everyone f fly.
Give no one f fly.
Make f fly easily available through voting or possibly make it purchasable with in-game currency.
Keep it as it is and have a boring map with like 25 players online and 2 big factions.