i suspect p5 was given free for this very reason. more will pay for an upgrade than the full price. if a lot wouldn't buy p5 , they prob wouldn't buy p7.but now they have it for free  they may pay to upgrade to  p7

Very good point Billy, that hadn't occurred to me, but I think you're right.

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"you are terrifying
and strange and beautiful
something not everyone knows how to love." - Warsan Shire