And that 25% is EACH year. So if somebody was paying $3k maintenance, and sage wants them at $6k, they will keep raising 25%/year until they get to $6k.
All this so they can get upgrades to new versions with very little new functionality other than bolt-ons that involve monthly subscriptions that Sage want's to make margin on.
They feel its like boiling frogs slowly and are hoping the increase in revenue will offset anybody abandoning the solution. If somebody stops paying maintenance and wants to come back due to incompatibility with say, Windows 9, then they will happily switch them over to the 'affordable' subscription plan which essentially gives Sage 100% maintenance rates.
Smart!