I interviewed for an internship as a therapist at a clinic. I'm doing a masters in social work and have a solid background in working with troubled kids already, and have some really good certifications to boot. I'm also a bilingual English-Spanish speaker and am near the top of my class. The manager told me “we usually pay interns minimum wage ($7.25) but we might be able to give you $10. I have a family to feed, bills to pay, and student loans building up, and I told them this. I told them it wasn't worth my time to make that little.
Fast forward a few days. I get an email from the same manager saying he and his colleagues reconsidered and are willing to pay me $22 per hour. Always argue your worth, because someone might recognize it.
Also, I know that not all internships pay. It's worth arguing with those organizations for pay in an effort to change the norm and get students the money they deserve in exchange for the work they do.