Why did book sellers start adding to Robin Hood's story?
Once the copy-write expires people are allowed to do what ever they please with a story. Robin Hood was composed before there were copy-writes so it has always been available to profiteers doing whatever they may to make money off of a story.
The robin brings a fresh new perspective to situations that are otherwise foggy and unclear. Try calling on robin energy for clarity when your judgement is clouded or when you need light shed on an issue. The red robin reminds us it's time to shake the sleepiness out of our head (both figuratively and literally), get alert, get moving, and start enjoying life!