Duty Roulette and FC Credits

[Thaliss]

Inviting New Members
Crafting anything High Quality
Gathering anything High Quality
Completing FATEs
Completing Duties
Completing Quests
Earning Achievements

It was tested I guess
http://ffxiv.gamerescape.com/wiki/Free_Company

[FJerome]

It was tested I guess
http://ffxiv.gamerescape.com/wiki/Free_Company

I can verify all of those except the Inviting New Members bit (not saying it doesn't earn points, just that we're too small an FC for us to have noticed if it does or not). Levequests also earn points.

It also seems to be affected by number of members online and the level of the quest/FATE/duty being completed.

[Alcyon1]

But now if we want to group with our friends and FC mates, we are "punished" because it will take much longer and more dungeon runs to reach the myth cap each week.

More runs : yes. Much longer : not really.
As a DPS, I have to queue for at least 15 minutes and it will take at least 30 minutes to get at most 90 myths. With my FC, i can run the Manor twice in 45 minutes for a total of 100 myths or WP 3 times.