Out of curiosity, when new versions of iOS and macOS get released over the next several years, are you willing to pay for the upgrades the developers will have

Out of curiosity, when new versions of iOS and macOS get released over the next several years, are you willing to pay for the upgrades the developers will have to inevitably release in order to maintain compatibility with the OS? Or do you expect your initial $59 purchase in 2013 to truly last in perpetuity?