Simple: it's in the title.
I like to change my stamps occasionally, but I might someday want to use the old one again. Then I have to either remember the old configuration, or if I have a screenshot, manually redo it.
I suggest a function to save stamp configurations to a saves tag, and give them a name. Clicking one would bring up a warning (if you have stamps placed already) and if it is confirmed places the stamps onto the collection. That way, old stamp configs can be kept forever.