I just started Eureka.

[Lambdafish]

If its fun people will do it, its a game, nobody get any reward for playing it to begin with, if its fun it don't need that much different reward hidden under so much RNG... Make it fun first and then give player a treat for doing it.

Reward systems themselves are game mechanics. The idea that "content must be fun without reward" goes against many game design principles. Gambling relies entirely on that idea, are you saying that poker or roulette is poorly designed because its not fun without reward?