There is no way that the cost of running scalable registries is increasing at such a pace -- in fact, it's certainly past the scaling phase and stabilizing as web infrastructure services have become a commodity.
Allowing these price increases serves only corporate greed and not the public good. It will harm the availability of registering domains in low-income areas of the world, effectively contributing to drowning out the voices of those who most need a voice through the internet/web.
--Kyle Simpson