The true purpose of a security suite isn't to secure your computer. It's to protect you, your privacy, and your data. With customer protection in mind, McAfee Internet Security installs on all of your devices. However, most of what it offers comes with McAfee's antivirus, and the additional suite-specific components don't add enough value, especially if you don't need antispam or parental control.
At $79.99 per year, McAfee looks like it's right in line with the competition, price-wise. Bitdefender and Kaspersky charge the same, within a nickel or so. But look again. With a Bitdefender or Kaspersky subscription you can install protection on three PCs. McAfee is unlimited, and lets you protect every Windows, macOS, iOS, or Android device in your household.