Ah yes the materials.....another reason i make most of mine out of re-cycled materials.....keeps the end cost down...meaning more sales......and a better hrly rate for me!?
But in seriousness it is a whole another ball game if you are using expensive materials and yes you need to charge for them!!!
Here is a 100% recycled material knife of mine....OK so i bought the Kydex for the sheath but the rivets are old gas pipe, the lanyard an old boot lase etc.
P1060496_zps1zelylq7 by Terry Griffiths, on Flickr
P1060501_zps6vqkwqii by Terry Griffiths, on Flickr
P1060518_zps8azz