Again, “gambling” is debatable in the cases the OP raised, as in all cases there is no possibility of the purchaser getting nothing in return. The legal definition of “gambling”, certainly where I live, requires at least some prospect that your stake could be lost completely with no return.
Pack-purchasers may not want to receive the less-desirable of the possible outcomes, and may consider those outcomes a rip-off, but as you and I have both pointed out someone should decide if they are prepared to pay the price to get the least desirable outcome. If the answers is “no”, they shouldn’t be buying the pack.