My opinion: You should be less transparant about the costs/profit, and you'll probably get less resistance for the fact that you're making some profit on it. I

My opinion: You should be less transparant about the costs/profit, and you'll probably get less resistance for the fact that you're making some profit on it. If you would just say "$10 of every sale goes to Wikipedia" people wouldn't know, but also wouldn't care that you're actually making a small profit. Test it out using some A/B tests.