With wordpress:
- you are now suddenly also a database administrator
- the different people touching the admin interface will break things in subtle ways
- welcome an incomprehensible security nightmare into your life
Yes, wordpress is extremely easy to set up. Maintain? Nope!
Good managed wordpress starts at like $10-20/month. All those problems you mention go away, you can even do things like rollbacks if someone breaks something. If what you want to do fits into what WP can do pretty well, it's a no-brainer.
I co-organise an event with a non-technical friend. Previously it was using some sort of a custom cms which was hell. I set it up with Jekyll, created a GitHub account for my friend and taught him markdown (five minutes perhaps). Yes he breaks things occasionally. That's fine! Everything is versioned, so I can easily fix things.