Dynamic item obtain rate based on player progression, action, and other in-game behavior

A computer-implemented method for rewarding completion of game tasks in an online game by users, wherein the users include a first user, the method being implemented in a computer system that includes one or more physical processors configured by machine-readable instructions, the method comprising:

• automatically monitoring, by the one or more physical processors, activities of the first user;
• automatically determining, by the one or more physical processors, a first amount of time related to the activities of the first user;
• automatically determining and/or modifying, by the one or more physical processors, a first probability of the first user being provided with one or more potential reward items subsequent to performance of one or more game tasks within the online game, wherein determination and/or modification of the first probability is based on the first amount of time;
• selecting, by the one or more physical processors, a reward to be provided to the first user subsequent to the performance of the one or more game tasks, wherein the reward is selected from the one or more potential reward items in accordance with the first probability;
• and
• subsequent to the performance of the one or more game tasks, providing, by the one or more physical processors, the reward to the first user.