[shiggerino]

>Are you unconvinced that an entirely homogeneous group is unwelcoming to people outside the group?

That depends entirely on the signals they send out to those people outside. If they were out setting crosses on fire, then absolutely, I'd agree with you.

>Diversity in groups is perpetually self-limited by images like this.

I just don't see the homogeneous group in the image. In fact the people in the picture seem quite heterogeneous. A perfectly adequate image to illustrate the purpose of the company.

I'm sure there are people out there who would balk at the concept of joining the group in question. Such as snooty noveau riche types that refuse to dine with plebs, black rappers who harass others for "acting white", or the Sura 5:51 orthodox, but in those cases they are the ones being divisive, not Captain's Table, and there is plenty of potential for diversity between the extreme outliers.