I have two Fallknivens - TK3 with cocobolo and NL3 with leather - and a Bark River Boone II with amboyna burl.
There are some simple economics to this. The more expensive the knife, the more expensive it is to change the handles. Fallkniven blades are, generally, more expensive, as they use more exotic metals and require more time and expense to make (especially the laminates). That's why their blades are made by Takefu in Japan. My impression, after speaking with people there, is that they are very traditional in their overall design and choice of handle materials. My TK3, for example, has a laminated "super steel" blade made by Takefu, and was put together and finished by Fallkniven.
You are paying for the wide selection of BRKT handle materials. It's like having a dozen option packages on a new car. Believe me, the cost of having all those options is figured into their prices (in addition to the variable cost of the hard woods involved).
That said, these appear to be very different companies with very different approaches - although, both make a lot of hunting and wilderness knives. I see them filling different niches, not the same one.