That works when you're employing a bunch of Wordpress monkeys who do nothing all day but mess with CSS and install plugins. Not so much when you've got a mature SAAS product, parts of the system are tricky to work with, and stakeholders are breathing down your neck to implement new features so you don't have time to cross-train your teams.

Losing people who are experts within the domain of the software they're maintaining because you refuse to invest in them is going to cost you thousands of dollars... the only question is whether that's tens or hundreds times that amount... and in some cases it can cause you to lose your entire business.