From the house edge calculation point, the statistic probability of making money on slots is much bigger than the same way calculated making money probability for Blackjack or Baccarat. The slots usually have the 6%-8% house edge(AFAIK), so it is logical to expect the huge promotional demand by the casino management in order to lure the majority of site visitors. The welcome bonus offered free spins and huge wagering requirements is directly connected to this purpose, so don't waste your time convincing gamblers to prefer dice over slots.
I did not understand your thought. On the one hand, you say that slots have a bad house edge (compared to dice, since it is about 0.5% there) and correctly show the motivation of the casino, but on the other hand, make a choice in the direction of slots. I misunderstood you?