Here's a thought...
How many different printers come out every year? With that, how many different cartridges have also come out because of those new printers? How many of the older printers still have cartridges on the market?
Point being, yes there will be x-amount of people who buy this kit and will be eligible for free ink 4 life.
But there are also new buyers of printers that will also be looking at trying to save money after they get to a point when they realize, it costs a few bucks in upkeep.
It's a great marketing idea and if this is as successful and it's business plan, this will be a life changer for a lot here.