Why do orange guppies like to be accidental scoop-ups???

When I went to get my first three guppies at 7 seas, as I was getting the last one, a orange guppy that looked exactly like Orange! The guy said I could have it for free, just like Orange!!! I got Orange at Aquatic Critter, and it was pretty much the same thing there!!! Why on earth where they both accidental scoop-ups?????????????