For me, just really getting rolling with casinos, I have found that RTG casinos convert the best for me:
Casino33 (affstorm affiliate program),
Club World Casinos - Lucky Red, Club USA/world and Aladdins Gold.
Bodog Casino also converts well but I can't say if it is poker players moving over or straight sign ups.
I have a slug of Rival brands but they really lag behind, I have the best luck though with the 4 offered by 400 Affiliates, Cocoa Casino, Paradise8, ThisisVegas and Davincis Gold are the brands. All have ND offers and Cocoa/Paradise8 AM is good to me.
Hope that helps.
Forgot, I just added All Star Slots (Affiliate Edge) Although it is too soon to tell, the AM there, Elliott is top notch so far. He will ask if he can phone me and we have good conversations on ways to improve the conversions, new promos, etc.
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"People who are unable to motivate themselves must be content with mediocrity." ~Andrew Carnegie~