For getting your website going online, you need wordpress whether as the site CMS or as a blogging tool. But you do not want to bother yourself with the frequent updates to the wp core, plugins or themes etc. and just focus on the business and marketing aspects of the website. You might be better off with a high performance service that cares of the speed, scale, security and reliability. Or probably, you are an advanced user interested in the premium technical features. Wordpress.org users who are tired of doing all the IT stuff themselves and are looking for someone to manage the servers so that the blogs can scale with ultra fast loading times especially when the blogs are getting lots of traffic from their site visitors. VIP support includes fanatic support for backups, infrastructure-wide issues and server maintenace tasks.
No need for a VPS or dedicated box and spending time daily with the nitty gritties of running a blog online. You have the option of enabling CDN for improving the ability to serve content to end-users with high availability and high performance. You get features such as protection from DDOS attacks, prevention of hacking attempts. The servers use IDS hardware that can block thousands of attacks daily. If you have been using wp regularly and your are beyond the point of your technical ability or you have lost the desire, for whatever reason, to maintain your blog mostly due to huge amount of traffic and business. Probably you do not want to worry about installing and maintaining mod_security, nginx etc. or want to stay away from often checking and applying for wordpress security patches.