I’m not one to defend Amazon B2B, having blasted it as recently as here
However, I do see (and have taken) some benefits on the business only offers
You don’t have to give a regular price, so the business price is whatever you want it to be.
Particularly good for larger or bulk orders. And it has also saved me having to deal with quote requests, which are usually unmatchable BS
It may be better for FBM, which I well know you aren’t, but IMO is the main salvageable part of B2B and the reason I still suffer it