I agree with Disco Stu. $10 with $15 being the outside. Thats what I charge for my shop made Kydex rigs. I also have no problem with paying Blade Tech $60 for a concealex multi position rig with TekLok. Why? because it is worth it. I also have no problem paying Normark for his work, once again it is worth it.
No offense (considering your peice is better than what I do), but your sheath is large, bulky, and single position. It is also not nearly as crisp and clean as what the specialists are putting out.
Making a statement such as "have you seen what the other guys are getting for theirs" is much the same as saying why are my knives not selling for as much as what Chris Reeve gets for his. The market will in the end decide what something is worth. If you truely feel your work is as good as Blade Tech, On Scene Tactical, or Blade Rigger, than put a $45 price tag on it and see what happens. But I might as well ask $700 for one of my Model 10s.
I have also seen where you ask for input and then complain about a tough crowd. If you ask for input, expect that not all will be positive. But hey, I have Bill Herndon and others tear my knives to shreds at least once every couple months. Without truthfull input a maker can never improve.