Software gets more expensive over time when you write it like spaghetti coded crap in a "move fast and break things" environment where you build so much technical debt that you can't touch anything without breaking 5 other things, and suddenly even simple changes take hundreds of developer hours, which you don't have because half your team is fighting bugs.

Luckily all of our most critical services run on well-developed platforms that get the time and resources they need to be durable and maintainable over time. (biggest /s I've ever written)