Probably jsut becasue they're lesser known brands, slow moving. The Vosks are pretty good.
Of course that is the other possible reason. (it may even be the other better reason)
Considering you can get Astra SP at under 10c/blade delivered
They simply aren't moving fast enough.
They are good blades but they are utilitarian Soviet blades. They were hyped up and were overpriced in the market. RB&M bought his stock from the last importer (name escapes me this second) who made a tidy profit on the bulk stock he had at the time.
Purely and simply - they aren't worth what is being asked for them now. I would think $13-$14 per 100 would be closer to the mark, not the $18-19 per 100 which is being charged at the moment. Considering you can get Astra SP at under 10c/blade delivered, then these are simply too expensive.
It seems that the TSD group buy is also upsetting the market along with the distributors behaviour!