My wife would like to suggest that sample libraries should come with free stuff for the spouse - e.g. you might market a small library with a free gift of a make-up compact or screwdriver set; a full-blown orchestra with a handbag or power tools.
Personally I think it's a dreadful idea. I have absolutely no self-control, and my wife's disapproval is the only thing that stops me buying libraries on a daily basis, and bankrupting us. If she had an incentive to say yes to all my purchases we would be in real trouble.