Other may be Oblivious & Some may see it therefore "Caveat Emptor"
Man, you need to wake up.
Yes, i myself know that if looking for third party (ie Tamron, Sigma, Tokina) lenses in Pentax mount, they will cost more than in Nikon or Canon mount.
But to say that is price fixing by a cartel, you are living in lala-land.
And if indeed that's price fixing (which is so far fetched as to be quite lunacy), very simple, go get Pentax lenses, dont get third party Pentax mount lenses.
Or, just as you did, jump ship to Canon (or Nikon).
If you dont agree with the pricing, that doesnt necessarily mean there is "price fixing cartel".
Go figure what does "price fixing cartel" mean, before even thinking that term.
Good for you that you moved to Canon R.
But, again, that doesnt mean "price fixing cartel" yeah.