You are wrong by pushing your changes on "slow to update" customers. Customers know when to update much better than you do. If you are trying to update before they want to, you are doing them a disservice.
This attitude is inspired by the desire to sell more, and often times, it means to sell more unwanted crap, where customers are trapped by the "package deal", where they are either forced to update to gain useless features and the headache resulted from various inconsistencies and defects coming from the last update, or they are unable to get the product at all (because the provider cancels support or wouldn't sell older versions etc.)
In other words, you with straight face describe some really shady practice and you don't even realize how bad it sounds.