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I think it's the part of having bleeding edge packages easily linked into your system. Other options might be available but people simply don't know about it. And developers themselves might already provide the PPAs which means there are many PPAs available.

Might be the worst solution but is the most well known.

All of it together, while providing a relatively straight forward interface for the consumers of the package.

> It is pretty easy to setup your own repo on a server using reprepro or aptly

Sure, it'd easy to set it up yourself. But the point is that PPAs are managed by someone else and have already been set up.

If I want a new software, and there's a PPA, I can just use that PPA and be able to use it straight away.