there are many times people do good deeds for their own purposes. I am not talking so much about your example but such as giving tzedakah at a chinese auction. very few people are participating because it is a tzedakah event but rather because they want to win the prizes and they have to give tzedakah anyway so they may as well do it this way, but ultimately they are still doing a mitzva. I am sure they get credit for the mitzva that was done even though it was done for personal gain.
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