What some people don't understand is that rabbits are just like any cat or dog. They like to play. They have emotional and physical needs; they need to be active, and to exercise their minds.
In the wild, rabbits are naturally very brainy creatures. When I say "brainy", I don't mean they are particularity smart (which they are), just that they have to use their minds for staying alive. Most of it is instinct; however, a dumb rabbit with no brain isn't saving itself from anything.
Domesticated rabbits have to use their minds a little less than they would have to if they lived in the wild. They don't need to be constantly aware of their surroundings; they don't need to forge food for themselves; they don't dig for burrows, food, or nesting; they don't (hopefully), need to run from predators; they don't need to protect their young from danger.
Toys that hide treats bring out a part of the rabbit that might otherwise be concealed. Searching and smelling out the treats stimulates their minds, and brings out their instinctive foraging behavior.
Some rabbits have just a feeder and water in their cages. What do they do all day? How do they exercise their minds and stay happy? In my opinion, a happy rabbit is one that will breed easier; take care of its young better; and be, overall, funner to play with and be around.
I don't have rabbits just because they're cute and easy to make a quick dollar on. I raise rabbits because I truly enjoy this little creature that God put on the earth. And if we TRULY enjoy rabbits, we want them to be happy, right?
To see some fun toys to make for your rabbit, visit this page! http://hollyshollands.weebly.com/bunny-fun.html , for inexpensive toys to stimulate your rabbit's mind!