It's simple they want to maker money off of the razor and off of the blades. It's ongoing revenue.If OneBlade would abandon the idea of what amounts to a "proprietary blade," and instead make it so that the razor could accept GEM blades without alteration (other than de-spining, perhaps), I would consider one of these razors, even at the exorbitant price (or purchase the Hybrid, which is more reasonably priced). But I cannot and will not if they insist on forcing the shaver to use the Feather blade.
I suspect I'm not the only person who feels this way, or at least feels that the requirement for the Feather blade is a major hindrance to consideration of the razor. They must be making a lot of money off an agreement with Feather, since they made the decision to essentially alienate a group of their target market with this strategy.
The other thing they could consider would be making a version 2 that would accept GEM blades or Feather AC blades, or DE blades. Anything besides being stuck with those Feather blades.
It makes business sense for them to follow this model. But it makes consumer sense not to buy into it.