ouch, that's a nice increase.
the lower grit sure have nothing special, the sintered plates starts from 1K below they are "classic" diamond plates ... but if you tell me they are not worth this price i'll try to source them from another dealer. maybe the big japanese marketplace i don't remember the name.
I didn't say they weren't 'worth the price.' I said they are sold for much cheaper elsewhere, and there is nothing special about them. There are plenty of people who prefer to pay the higher prices and feel it's worth it to them to do so. I'm just not one of them, and it sounds as if you aren't either!
Stitchawl