'Whatever you want to pay me' usually leads to a higher tip, especially if that person does an excellent job.
Providing a service upfront reverses psychology. It sets the stage, quid pro quo. Yet adults always advise college students never to intern for free. They encourage money before experience. Money is an evaluation of work, just as grades are in school. But does every effort deserve compensation?
No one's paying me to write this blog, nor do I have any advertising on it. I get to share my knowledge, thoughts, and inspiration with the Internet. Writing keeps my brain fresh. No one is going to pay you, whether it's with money or attention, until you offer them value first.
Bonus: If you're already passionate about the work you're doing, you're all set.