PS4 and Switch sales comparison: some things to consider

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KLAMarine said:

zorg1000 said:
I think all these points are irrelevant.

I think I should have made clear that often times, I see some impressed by the PS4's sales. One can see this going through http://gamrconnect.vgchartz.com/thread.php?id=239744.

For whatever reason however, no potential caveats are ever brought up. I have yet to see any mention of PS4 and PS4 Pro sales figures being lumped in together for example.

What does that matter? Should we not count Sales of Pokemon versions because a large amount of people buy  multiple versions? Is my purchase of Yellow version invalidated because I owned Red?