It seems to me that its necessary to forget about traditional promotion methods and focus on advertising in casino and poker houses.
Its bad strategy GG target audience is much wider than the visitors of the portals mentioned by you.
But I think that this directions will allow to show the highest level of conversion. It will be possible to attract as many clients as possible for minimum possible amount of money.
You wrongly assume that all the people fond of gambling games will start participating in lotteries immediately. This statement is far from being true.