Muslims must never do good and expect worldly gains in return:
A true Muslim must always do good and never expect any worldly gains in return. Allah Almighty said:
"Those who spend their wealth for increase in self-purification, And have in their minds No favour from anyone For which a reward Is expected in return, But only the desire To seek for the Countenance Of their Lord Most High; And soon will they Attain (complete) satisfaction. (The Noble Quran, 92:18-21)"
A Muslim must never go after worldly gains. It is important to always do good for the sake of Allah Almighty and not for the sake of popularity or self recognition. A good work is fruitless if it's not done for the right reasons. Therefore my dear Muslim brother or sister, you should always do good things for the sake of Allah Almighty alone so He would further purify your soul, and bless you with both worldly rewards and Hereafter rewards.
Islam and the Noble Quran - Questions and Answers.