Business websites require a lot more involvement than a personal blog does. There is something constantly going on in the business outside of the website that needs to be updated on the website. This could be products, inventory, new services and other things. This gets added to the content of your website. Every article, instruction, image, video, product and service description is content on your website. However, there is a whole lot of stuff that goes on behind the scenes with business websites including everything from hackers trying to get in to techs doing server migration as systems evolve.
Big business websites have teams that manage everything from taking product photos to security experts who monitor those attempts by hackers to force their way in or utilize new exploit discoveries. Like brick and mortar stores who have people who do everything from setting up displays in windows to loss prevention, there is an equivalent for business websites. It would be great if businesses that have offices and stores could just have their already existing personnel do double duty, but it does not work that way. You need experts in website design, server management, IT, content provision, SEO and so much more.
Fortunately, people like that already exist, and you do not have to hire them as employees. Large and small firms exist that have resident experts to handle all business website tasks no matter if the company is a regional, national or global one. Plus, they are an expense for doing business, so think of the tax benefits. Even small firms are hiring better domain and server management firms because of the ongoing increase of business being done exclusively online. Businesses are seeing that need to keep up if they hope to be viable as time wears on. If online businesses can sell groceries, pet food and even have virtual doctor consultations, pretty much any business can have an online presence.