To echo a bit of what petco said above, virtually everyone's exposure to interracial sex, or cuckolding, or interracial cuckolding is different.
Mine wasn't one experience that opened my eyes to it... it was a progression, with multiple experiences over decades, that led me down this path.
I continue to experience things that further refine what interests me about this lifestyle and the women in it.
Mine has less to do with alpha/beta status and more to do with providing an environment where my woman can experience pleasure and freedom and control in a way most women in traditional relationships can't even dream of. And if that means I have to sacrifice or suffer so that she feels that extra sliver of sexual electricity, then so be it. As important as the physical side is, getting into her mental sexuality is more important from my perspective.
So the psychology behind it is, when it comes to this lifestyle, if you can make a woman orgasm, you can satisfy her... if you get into her brain and stimulate her mentally at the same time as physically, you fulfill her.