All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad is His slave and Messenger.
If the games you bought are permissible, then there is nothing wrong with keeping the account to benefit from these permissible games.
Nonetheless, we would like to emphasize the importance of saving time and money and warn from spending them on useless things. On the authority of Ibn ‘Abbas the Prophet said: “There are two blessings in which many people incur loss: health and free time.” [Al-Bukhari]
Also, Ibn Mas’ood narrated that the Messenger of Allah said: “The feet of a servant will not move on the Day of Judgment until he is questioned about five things: His life how he spent it, his youth how he used it up, his wealth from where he earned it, and where he spent it, and about his knowledge how he acted upon it.” [Al-Tirmidhi]
Allah knows best.