You're missing my point. It is not an iron law that every payment service needs to build the lowest-cost, most efficient Wal-Mart of payment processors. I'm asking, how do you know that the entire point of their business isn't to find out if lots of people will pay extra for superior support?
I don't follow your logic. Finding out that you need to raise your prices to capture value is a basic fundamental fact of life in entrepreneurship. You keep talking like Chargify broke a sacred promise to their users. This rankles me: in business, we have a word for "sacred promise": it's called "a contract". Chargify serves businesses, exclusively; you'd think its users would understand this fact.
It is not reasonable to take offense at a business getting their initial pricing wrong. Everybody gets their initial pricing wrong.
I seriously think Chargify might be making a bigger communications error now than they did by pulling the bandaid off on their new prices. They're creating uncertainty about whether they'll revert to old pricing, or create some "wash the dishes for your meal" freemium model. If they need to be charging this new rate to make the business make sense, it's their business, and it is fundamentally and totally and categorically their call to make.