Is it wrong to do good things, for personal gain?

Not totally bad because you put in the effort. But the reward should only be about feeling good about yourself.

The kind of gains can be subjective.
Since, you sought for an advice, personally, I don't associate popularity and attention with service. Service to me is done selflessly.

I think it is best to do good in the world for no reason other than it's the right thing to do.

But, if you will only do good if you get recognition, at least you are doing good.

everyone does everything for personal gain so unless you think good doesn't exist, no it is not wrong.

well it's better than nothing.

I think many celebrities and sport figures happen to do this already. They are donating to some charities or doing community service to look good, but at the same time, they are garnering attention from it.

I think it is.

it's a kind of trading stuff for another stuff? It's business in a way, no ??

No you still help people out so kind of selfish but not totally bad

.do good or bad things only for personal gains