Llamas greet others with a soft sniffing and blowing in your face which I call whiffling. Stand still and let the llama approach you. You'll probably be rewarded with your first whiffle. Many enjoy being scratched or rubbed and spending time with 'their' humans. Some doctors have recommended them to high stress patients who need to relax.
Llamas have a variety of types and colors of useful fiber.
Some people have found they make good sheep guards , but if you have anything other than lone coyotes as predators, your llamas may end up as preyed upon as your other stock. The worst offender may be your neighbor's dog, the one they think would never harm a soul. More llamas have been killed by domestic dogs than by any other predator. Once a dog has attacked stock it will continue to do so. Llamas are currently being raised in every state in the U.S. and many other countries.