I find that it is almost impossible to get luxuries in trades. My opponents expect to get luxuries for next to nothing but they demand tons of gold, high level techs and even a luxury as well for me to get one luxury. I do tend to have larger empires and I know that they think I get more out of having a lux but they just seem to demand way too much and they cancel the deals as soon as possible. I refuse to pay an arm and a leg for luxes but I am wondering what I can do to get better deals? I am starting to think "Give me this or else" is the best answer.