Most of the time there's no need to use a PPA, because common software packages are already in the official repositories. But for custom builds, latest versions or simply packages that you can't find in the default repositories you need to use a PPA.
Sometimes, a PPA may not be needed anymore. Maybe the package from PPA has been added or updated also in the default repositories. Or you plan to upgrade the OS to a newer version and the packages for this version weren't yet built in the PPA (to prevent errors in this situation, Ubuntu automatically disables third party PPAs when upgrading). Or the PPA may not be maintained anymore and you get errors when updating apt cache.
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