$4.5k here... . Seriously though - am I grossly underestimating how complex the conversion of an outline into a non-functioning clickable Sketch prototype is?

$4.5k here... . Seriously though - am I grossly underestimating how complex the conversion of an outline into a non-functioning clickable Sketch prototype is? It's been a while since I was a full-time web dev/designer (my lumping the two together should indicate how much time.. :) but $6k sounds like a helluva lot?