Evolutionary game theory originates from Darwinian evolution, and combines game theory with dynamics together. Two kinds of analysis frameworks are mostly frequently used, i.e., best response dynamics and replicator dynamics (Jia, 2013). The best response dynamics model is aimed at small groups that have a higher rationality level and fast learning speed. The small groups can quickly adjust strategies based on the previous game. The replicator dynamics model is aimed at large groups that have a lower rationality level and simple simulation ability. When the adaptability of a strategy is better than the average level in the group, which means the payment of this strategy is higher than other strategies, the participants who choose other strategies will try to imitate and learn more from this strategy. Then, they will gradually adopt a better strategy. In this study, the developers and customers as large groups always imitate and learn from each other to obtain a better optimal strategy. Thus, the replicator dynamics model is applicable to this research.