I think an honest gambling ad would include wins and losses at an appropriate ratio and emphasize the excitement as opposed to the payout. I do think the majority of people engaging in gambling engage with it in that way (even if I don't understanding it), and that the people it effects so extremely negatively are a smaller minority. But, a) that smaller minority still likely makes up a very large fraction of these companies income stream, and b) the harm is large enough that banning the advertising is still I think the better option, anyhow.