I have to mix it up or I get bored. If I REALLY, REALLY like a design I make or had fun making it I might make up to 6 the same; uses up all the "base" card stock I cut for that design anyway. But usually I get bored after about 3.
I will make sure that immediate family all gets the same design but after that it's whatever strikes my fancy. I should keep track of who gets what card but I don't. I probably have sent repeats to a few friends over the years. Sometimes I like a design and if I still have the stamp set I'll want to make 2 or 3 more the next year.
Mary in NC