You just end up with an over-engineered product that has 4 spare 12V outlets that I'm not convinced you can even buy a ready-made lead for.
Spare power cables aside, this seems like a perfect solution for my needs. I'm currently using a Source:Five to drive 5 zones around the house, via non-M amps and speakers. I'm thinking of replacing the Source:Five, which doesn't handle high res files all that well (among other things) with 5 MS200s. Using the PPS, I can power those MS200s with a quality power supply instead of wall warts.
Seems like a perfect reason to have 5 power outputs to me!
Unless I'm missing something (besides spare cables).