1 When a person feels victorious, they are more likely to stop playing
When a person keeps losing, their frustration usually motivates them to keep playing. One of the reasons Flappy Bird got popular was that it frustrated its players, as it was very hard to win.
2 Frustrated users are more likely to make a purchase
If resources were easily available then a person might not need to make a purchase. The reason some games such as clash of clans became successful is that they frustrated people with lack of resources until they were forced to make a purchase.
3 Frustration triggers stubborness
If a person is stubborn then the frustration they experience will trigger their stubbornness and motivate them to keep playing until they win.
4 Frustration tempts the ego
When a person gets frustrated, their ego might get triggered and they might feel more motivated to win.
5 Finished businesses are forgotten
Studies have shown that people easily forget about finished businesses. When something is half complete, the brain is forced to think more about it.
6 A certain level of challenge is required
If a person found an unchallenging game, they will lose motivation to play the game and they will look for a more challenging one.
7 The frustration-release cycle results in positive reinforcement
When a person gets frustration then suddenly gets a relief, they experience pleasant emotions that makes the game more appealing to them. This technique was used in Tetris.
8 Frustration keeps a person hooked to a game
As soon as a person tries a game and gets frustrated, this frustration is very likely to keep them hooked to the game. A person needs a certain degree of emotional arousal in order to stick to a game. (See Why Do Gamers Get Very Angry?)
9 Winning satisfies the ego
When a person wins a challenging game, their ego gets satisfied and they are more likely to share the results or spread the news to their friends.
10 Frustration is one component of addiction
People are more likely to get addicted to things when they are frustrated. A frustrating game can keep a person hooked, especially if it's simple to understand. (See Why Online Games are addictive?)