While my ironman journey is just at its beginning, there is something I can foresee being an issue with many players who chose the Ironman game mode. That is, rewards for things such as Trivia and Voting aren't necessarily restricted, but they don't exactly encourage the Ironman base to partake. Albeit FOG tokens themselves I believe are worth participating in Trivia, voting is another thing. Voting is very important to the growth of the player base, thus accommodating all game-modes so that people want to vote, is also important (Or so I think).
Perhaps allowing Ironmen to open Crystal chests would be an alternative route, or even a different reward for ironmen (purely cash, skilling supplies, etc)
Thanks for reading this post and I'll add to it if I am to find anything additional.