Interesting to photoread the ads to catch the "fine print".

"What sells me" depends in large part, of course, on me (a variable). But that's probably not what you meant.

It helps me to imagine the details of using a product. Step into the picture, if you will. The information they provde has to fill in enough of the blanks. If they provide too little information (ie, you can't see how it would work, or they've left out too much) I walk.

There's always a gap, of course. (They don't want to give you the course in the ad). Taking the leap might depend on who's selling it, the importance of what they've left out of their description, the relevance of the material to my needs.