One mistake that I see a lot of people making is that they approach potential JV partners as though they are simply affiliates looking to make an affiliate commission. This is of course sometimes the case, but if your looking at A and B tier players they do not think of themselves as affiliates, and although your commission check is nice, it's not likely to be a huge reason for them to mail for you. They want to see that there is a strategic relationship that can be formed with someone, and so you should show them this.