Lotteries are scams. There are based on a weakness of human psychology. Variable ratio reward systems are the most addictive. Lotteries thrive on that.
Lotteries are profitable precisely because they don't give people enough payback to justify the pay-in. They only provide the illusion of doing so. Of course, this is the basis of all profitability. Businesses that give people equal value are "out-competed" by the scammers, provided the scammers are savvy enough. Business that give people more value than what the buyer paid for go out of business in short order.
The problem with lotteries that makes them worse than the general profitability scamming is that the buyer doesn't know what they're buying. Instead, they're buying a hope or a dream — via the variable reward system. That's a step worse than the buyer just not knowing what what they're buying is worth (or not being able to leverage their power to force a seller to provide equivalent product) — the basis of profitability.
It's bad business, in terms of ethics, to do things like the panel lottery in televisions. Even if it reduces the price tag to the consumer a smidgen it reduces the overall value potential of the purchase more when there is high variability in panel quality. So, the more "lottery" a purchase is the more abusive it is, particularly when it involves a large amount of money.
Since this card does not look to benefit all that much from the additional RAM and isn't a good value for Crossfire (in comparison with just buying one high-performance Pascal) the lottery effect here seems to be rather small.