They are insane.
They should be finding a way to compete with RunCloud's far better product and pricing (unlimited servers), not committing business suicide by charging for every domain you use on your server.
Under their new pricing, the plan that comes close to the features of RunCloud's $10 plan costs $10 per server and $1 per domain per month. They expect their customers to pay more for each domain than they already pay for domain registration every year.
Just to be clear, the RunCloud $10 not only has better features, it also allows unlimited servers and unlimited domains.
The only way ServerPilot works out cheaper is if you are willing to use the more basic $5 plan and will never have more than one server and 9 domains.