Disproportionate demand in sim2

I'm flying DTW to DEC (Decatur, IL) with a 739 and autoprice gives me ticket price $1,197.00 for one daily flight and a a nice profit correspondingly. This seems really disproportionate compared to other nearby little airports I am flying to which barely make any money with a Beech. I actually checked the Decatur airport web page and their only scheduled flight is to STL twice daily on a Beech 1900