The foil section is NOT symmetrical.
Just like an airplane is never symmetrical - it will never be very performing if it was
So the front foils are cambered, maybe just sligthly if high speed race foils, or a lot if low speed freeride foils.
And the thickness can also vary a lot.
A thin profile is faster of course, but needs more speed to lift, and can suck air down and "stall" much easier, so a lot more sensitive to errors.
The foils are not "plain straight" either - most have changing AOA out during the foil section (wash out), just like airplanes, for stability and agility.
A lot of variables, and I actually understand why the prices are like they are - quite reasonable it seems