I just started Eureka.

[Nariel]

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 is poorly designed because its not fun without reward?

Yeah and gambling is such a good exemple that it need regulation to even be legal. What I'm saying is if the content is fun, appealing and people have a blast doing it once the reward aquired they may be willign to do it again for the fun of it. Content shouldn't depend only on its reward to stay alive past the first completion. Eureka should have a reward in the end but hidding what should have been reward under abyssimal RNG layer just make it worst and less attractive.