Sure, I have two.
1) Did they offer you equity for the initial summer position?
2) What motivated you to go work for them for free?
1) Did they offer you equity for the initial summer position?
2) What motivated you to go work for them for free?
2) Being in school, the money wasn't a huge issue for me. They took care of my housing and most of my living expenses, so it's not as if I had to support myself on no income.
More importantly, the opportunity was just too good to pass up. It's rare to get the chance to be at a four-person company. I knew that I'd get fantastic experience and learning out of it. After just two years of school, those two were more important than money.