If you’ve ever installed MySQL on Linux, you know how easy it is. If you’ve ever installed MySQL on OS X, you know what a terrible pain-in-the-ass it is. It’s a pain whether you install the latest package directly from mysql.org, or if you install via macports. In order to actually make it work there are about a half dozen post-installation steps you need to follow, none of which are documented anywhere reasonable.
If you’re a Mac user and you want to use MySQL for sabermetric analysis, save yourself some headaches and use the script.