(native) Mobile apps in the same price range as websites? That's really not my experience; it's most of the time double or triple what a website with similar functionality would cost.
I was surprised by the results myself, I expected the average price for a mobile app to be much higher than for a website.
But more and more designers are focusing on mobile design. Just a year or two ago it was still a fairly rare specialization, but if you browse Dribbble you'll see that most good designers have at least one or two mobile projects in their portfolio. So that might be one reason why prices are being driven down.
Just for the design? Was that an agency or freelancer? Seems pretty expensive for a freelancer, at least according to the survey results (and my own experience).
