Why players prefer to grind. Different people give different answers. Most people think that the primary motivating factor is the player’s signal aim and solitary goal to attain what appears to be the game’s ultimate goal, which means reaching the maximum level for many games. There is usually little or no incentive for players to continually seek new challenges. Some players seek for the aim not for the fun and exciting experience in fighting with mobs, and once they find an easy way to reach their goal, they usually will not be willing to meet new challenges or tackling news risks but instead repeatedly play through familiar content. Some players sometimes might regard repetitive tasks as a way of relaxing, especially in the situation that performing the task has a persistent and positive result. 
Another reason for players to grinding might be for the aim to be better at the game. Spending time on grinding often helps players to gain experience and level up. Besides level improvements, there are additional statistics boosts and abilities which enable players to defeat enemies easily in turn.