Because no one likes maintaining a website, (except me)
Designers don't like it, they like creating visuals.
Programmers don't like it, they like to write code that makes things happen
Sometimes it's left to a staff member or the business owner to do it. It's a job that gets put off when other work comes up.
The solution
Send it to me!
I have many customers who email me text and/or images with instructions on which page needs updating. I do the updates for them, that's it, job done.
I do website maintenance for many business and associations. Their websites are always up to date.
I can also do major upgrades including additional services and make-overs.