Kind of a doctor

We were driving to preschool this morning and Elliot saw a garbage truck driver as we were getting on the highway.
"Mommy, look, a garbage man -- he's a community helper, you know."
"Yes, he is."
"You are a community helper, too."
"I am?"
"You're kind of a doctor."
"I am?  Wha ...?  No, Elliot, I am not a doctor."
"Yes, you are Mommy.  You raise money for kids with cancer."
"I do do that."
"So you are a doctor.  You make them feel better."
"I'm not really a --"
"Yes, you are.  You are kind of a doctor."

If I am a doctor, why doesn't my bank account show it?