I just work hard

So I met a hair-dresser who works at a local shop and was admiring his brand new Mercedes Convertible and the following dialogue ensued.
Me: Hey, is that your car?
Him: Yes, it is.
Me: It's a very nice car dude. How much was it?
Him: About $50K.
Me: Cool!
(I am thinking whether I should ask him the following question but could not resist it)
How did you afford it?
"Him (indifferent smile) : I just work hard."
He parks it near where I work and I see it sitting there sexily through the window.