They do, by buying the next version. On the other side of that coin is making the next version better enough that people will upgrade. For security/bug fixes,

They do, by buying the next version. On the other side of that coin is making the next version better enough that people will upgrade. For security/bug fixes, yes, there’s a better incentive for fixes in SaaS, but then again, if you’re known to actually fix bugs, the likelihood of people buying the upgrades are higher, so there is incentives for non SaaS too.