Is there a tactful way of saying, "No, I do my computer stuff for a living, and these are my rates"?

A doctor and a lawyer are at a party and someone comes up to the doctor saying "I have this small problem that ..."

The doctor answers curtly, tactfully, as politely as possible, finally getting rid of them, then turns back to the lawyer and says "I hate that. Do you have the same problem with people constantly harrassing you?"

"Yes," said the lawyer. The doctor replied "What do you do?"

"I give them short, simple but accurate advice, and then the following day I send them a bill for my time charged at my usual rates."

"Fantastic!" said the doctor. "I'll try that."

The next day the doctor gets an invoice from the lawyer ...

Haha, so true and reminds me of this xkcd post: http://xkcd.com/627/

"Sorry, I don't know much about that. I'm just a programmer!"

I once had this kind of response from a lawyer when I told him what I did. I said to him that if you needed a criminal lawyer you wouldn't ask a intellectual property lawyer you met at a party to help out. I could see him thinking about fees.

"Fixed your response"?

Is this reddit?

I find that really rude.

It was a joke, but it was also the truth.