I hope that it was as easy as that. Just make ruleschanges that make people orbit towards more expensive cards and decks and hence make money... well in reality it isnt as easy, first, the hobby channel represents roughly the 10 to 15 per cent of the total market, mass channel is the big money maker here, where this rules changes affect or impact very little in reality, so I faill to see how this will greatly impact upon PUI's ability to make money. This rules changes impact on the second hand market, where PUI has very little to win economically speaking, just like YUGIOH, people complain about UDE reprinting cheaper version of cards, but in reality PUI wins the same amount of money from a booster with an EX thatn one with a normal rare, so a kid with 10 dollars can only buy 10 dollars worth of boosters, if there are cards that are more expensive, then he can trade or something, granted, a kid will look forward to buying more from a booster with good cards, but that has little to do with this, the point is that the rules affects very little the first hand market, and MAY impact on the second hand market.
Then, the rules changes are made by PCL, not PC directly, which means it is not a business decision, it is a GAMEPLAY decision, where PCL have very little idea of how will their rulings finally impact on the sales of their product on a larger scale, they just want to keep the game fresh.
Again, what would you consider to be "more expensive cards"? I say this because the japanese have exs on their theme decks, and all their packs have holos so I fail to find the connection again, no extra money making in making you draw for ko'ing a fossil, expensive cards here are not necesarily expensive cards on japan.
Is it a rule that is not necesarily fair? I might agree. is it sales driven? yes, only in the side that it is made to keep the game fresh, and so making sure that sales wont go bad from bad gameplay situations.
I dont see a direct link between the rules and a desire of PC, PCL or anyone at all to try to make an extra buck, and believe me, if it was any other way, then Id endorse it in terms that they are companies who exist to make money, and their means is by having the best prodcut on the market, pokemons way? having as great an OP stricture as possible.