You seem to be quoting the terms for the iTunes Store. The terms are confusing (because they throw all their various Stores and their different terms in one long document), so quoting the wrong part of the terms is hardly your fault.

The Mac App Store seems to have different terms for non-commercial and commercial use. Here are the terms for non-commercial use:

If you are an individual acting in your personal capacity, you may download and use an application from the Mac App Store (“Mac App Store Product”) for personal, non-commercial use on any Apple-branded products running Mac OS X (“Mac Computer”) that you own or control.

tl;dr: If you are not an enterprise, you can download apps for non-commercial use and install them on all Macs you own or control.

Here are the terms for commercial use:

If you are a commercial enterprise or educational institution, you may download a Mac App Store Product for use by either (a) a single individual on each of the Mac Computer(s) used by that individual that you own or control or (b) multiple individuals on a single shared Mac Computer that you own or control. For example, a single employee may use a Mac App Store Product on both the employee’s desktop Mac Computer and laptop Mac Computer, or multiple students may serially use a Mac App Store Product on a single Mac Computer located at a resource center or library. For the sake of clarity, each Mac Computer used serially by multiple users requires a separate license.

tl;dr: If you are an enterprise, you can download apps for commercial use and install them on all Macs you own and control as long as those Macs are also only used by a single person. You can alternatively install the app on a single Mac that is used by several people.

The terms are the same for commercial and non-commercial use, the only difference is that companies can also use their license as a single-Mac license (which can be used by as many people as they want).