I have never heard of donkey's milk. My grandpa kept a goat for a little while and when we went to visit, I was the only one who would drink the goat's milk. I didn't see what the big deal was. Plus, since it was fresh milk there was lots of cream.
I don't really drink milk anymore but if it didn't have an insane health food store price tag, I would try it. Hell, if it made me feel better I might even put up with a higher price.
Food is food. And good food is the best.