The poll leaves out some major categories. Cuckolding is fundamentally about a woman seeking another man's seed while retaining her cuckold for purposes other than reproduction. Purposes such as baby rearing, companionship, financial concerns and building a home life. Clearly, that has transformed into an entire lifestyle with many facets. But to assume that all cuckolds have an interest in their mistress's lover's cock is a stretch. Many are, at least some aren't.
I for one, am perfectly happy sharing a life with my mistress. Who she fucks is really her business. If she were to want me to participate I would but only because she desired it. To be a bit more complete, you should have some categories for cucks like myself who are only interested in the woman. That's not to say some of us don't get off on knowing our love interest loves BBC. There are so many different ways this all can play out.
And not all cucks are as wimpy as the poll would imply. That's part of the fantasy for many but in not universal. I believe there is a big difference between "submission" and "wimpiness."