We are still figuring it out. We will most likely have 4 tiers with the highest tier offering unlimited domains. We are thinking of pricing the highest tier somewhere between $400 - $500 and offer discounts to startups with < 10 employees.
Note that this is not final. I haven't given any serious thoughts to it. We'll discuss pricing if this works and businesses are willing to pay for this service. At this point, this is just an experiment.