Why so many Power plants for sale?


Seems like there are a lot of PS Audio power plants for sale. I have a P300 and I love it on my front end, and was contemplating a P600 for my video system (a Mitsubishi RPTV, Lexicon processor, Pioneer DVD & PSE amps) but was worried about the power consumption here in Ca. Has anyone compared the Hydra, Power Plants, Exact Power, and Equi=Tech. I know I have a power drop issue (PG&E wants to drop the voltage to 110 - 114 Volts) and the Power plant and Exact power can help there. The Hydra does improve the sound on high end systems, but is not balanced power and does not adjust for voltage. I've not heard the Exact power or Equi-tech, has anybody put them on video systems? And back to my original question, why are there so many PPs for sale? I love the one that I have, but can't use it for video.
sfinnell
I used the P300 for a few years then one day just plugged everything into a cheap extension block, after hearing the difference i never went back to the P300 i found it killed the dynamics when compared to a cheap budget extension block.
Now i use a Running Springs Dmitri which i plug everything into my system sounds fantastic, i believe passive conditioning is better than regenerating probably now everyone is realising this and selling on their re generators,
To anyone with  a re generator plug everything into a cheap extension block and compare the sound it will cost you about $10 you got nothing to loose and could end up cashing in the re generator.
17 years. I wonder what the median number of power upgrades is, over that time period?