If I was the surfer I would think that a gallery with mixed sets looked cheap and just like it is full of random porn that they can see for free. When it is a full set it is more like, these are the people you can see, it's more personal. It is also more like you are there when the pics follow one another, it's like "what's next? I want more". I wouldn't even concider mixed shit. I can't imagine it would convert very well.
