I mean as maybe unwilling someone was to buy a brick just to get that one free deck they thought would never be released any other way, they ended up purchasing a brick anyway. If you're willing to pay for a brick, why complain?
They complain because they're applying "cereal box logic". A kid sees a cereal ad on TV that shows a really cool-looking free toy surprise inside, a limited-time offer. He really wants that toy - he'll buy a box of the most boring cereal imaginable just to get that prize. He completely forgets that the money paid was for the cereal - to him, it was paid for the prize and just the prize, because that's all he wanted out of the transaction. If he could, he'd rather buy the cereal, get the toy, then sell the cereal minus the toy in order to get the toy for free - but there's isn't a huge market for open cereal boxes with no toy inside, especially when all the other kids out there are trying to sell theirs as well... Meanwhile, the entire purpose of the toy was to entice you to buy the cereal - but you're supposed to eat the cereal, since that's the point of buying cereal in the first place.
Here's a kid who paid for the cereal, got the toy, and now the cereal company is selling the toys separately - he doesn't see it as the freebie he got for the box of cereal he bought, he sees it as the toy that cost an entire box of cereal to get. He also failed to take into account that this cereal company always sells their toys eventually. This also ends up pissing off those kids who bought many, many boxes of cereal, just so they could sell the toys as rare, precious artifacts - no cereal necessary, just get the toy! Now that the company is selling the toys, they're not worth even close to the cost of the box of cereal it cost these speculators to get each toy, so they're stuck not just with all the cereal, but any toys they couldn't sell off before the company got into the act and started selling them for less.
The whole time, none of those kids are seeing the toys for what they are. At first, they were free giveaways to thank them for buying the cereal in the first place. Then, for those kids who really liked the toy but couldn't afford to buy a whole box of cereal, they try to make them happy by offering to sell them the toy for less than the cost of the cereal - but more than the cost of the original toy, which was in essence free.
And that is why there are many little boys out there pouting and saying bad things about mean old Blue Crown, the company that gave decks of cards away for free with the purchase of a brick of other cards, then offered to sell them separately for those little boys who couldn't afford to buy a whole brick of anything.