Sounds like an easy way to set up a test environment.
MAMP is installed in the typical Mac fashion: very easily. You can install Apache, PHP and MySQL without starting a script or having to change any configuration files!
What’s more, if MAMP is no longer needed, it is sufficient to delete the MAMP folder and everything returns to its original status (i.e. MAMP does not modify any of the “normal” OS X).