The demigods are called sakama devotees, or devotees with material desires in mind, while the pure devotees are called niskama devotees because they have no desires for their personal interests. The sakama devotees are self-interested because they do not think of others, and therefore they are not able to satisfy the Lord perfectly, whereas the pure devotees take the missionary responsibility of turning nondevotees into devotees, and they are therefore able to satisfy the Lord more than the demigods.

Srila Prabhupada; SB 3.912 Purport