A very good pair of questions.

1. Do others get turned on from being humiliated by their partner?
In doses, without question. I don't want to be talked down to constantly, but in the right times and moments... hell yes.

2. Does anyone have an opinion as to why its an erotic experience for some?
I think this is similar to why some people enjoy scary movies... you can get a rush without experiencing the consequences of an action. Humiliation play is just that, *play*. It, as a submissive, to me seems like just another thing you've handed over. Your body, probably your right to orgasm... and once in a while, your right to dignity as well. I posted a fantasy in the Sexual Fantasy section here about having a FemDom woman tease me over my cock size (despite not really having anything to hide there). Humiliation leaves one feeling very exposed, and raw... and as long as it's being done by the right person at the right time, it can be an amazing feeling.

I suppose it's the mental version of sadism/masochism. Just because you like a paddling at home doesn't mean you'd want to get smacked by some random person walking down the street. Humiliation play is the same concept, simply from the mental end only. Or even somewwhat physical, if you're into, say "feminization" of men, or something like that. Name calling can be very powerful, as long as everyone remembers this is a game. I might enjoy crawling around on all fours naked, begging for the privilage of giving out oral favours while being denied my own pleasre. Now that's a degrading thing. But in the home it's fun, it's not like you'd ever do it anywhere else.

I will say in my experience, it's important that everyone does keep in mind the "play" part of humiliation play, which is why I think it should not be a full time thing. Too much, or too believable too often, and the mental effect would be far less fun indeed.