I am not really sure it's the price change that is most offensive. It's the fact they were willing to do it without regard for their current customers. I don't want to deal with a company that is happy to change their price whenever they feel like it and I get the short end of the stick.
Trust me, we weren't happy about having to raise the price. It was a painful, hard-fought decision to change it internally, and to not permanently grandfather existing customers. But in the end it's about having a sustainable business - the worst possible outcome for customers is for the service they were powering their billing with to disappear altogether.
