WordPress Management: Ongoing Costs to Help You Budget
While the WordPress software itself is free (thanks to the GNU General Public License), running and maintaining a WordPress website comes at a price. Technically, you can start a blog for free on WordPress.com and never pay a penny to keep it going. But in order to be truly effective, you need to treat your WordPress website as a business investment.
SOURCE: https://premium.wpmudev.org/blog/wordpress-management-ongoing-costs-to-help-you-budget/