They pay more than the price cap, but less than the market rate (because they don't have to pay market rate now that Russia doesn't have much choice of customer

They pay more than the price cap, but less than the market rate (because they don't have to pay market rate now that Russia doesn't have much choice of customers - supply and demand). And that's really the whole point. We'd prefer for China and India to support the price cap because that would even further reduce Russia's customer base (and by extension the price that they can actually sell at). But even as things stand, Russia is losing profits hand over fist.