It is well known they don't do anything.
Is it a gesture of appreciation perhaps? I happen to doubt that. Because when I appreciate something, I tell the person. I commune with them.
No, the real reason people send me llamas is because they think I will look at their galleries if they send me those things. Well it's not gonna happen. So STOP sending me those walking sweaters!
Llamas do absolutely nothing though...... I have like a thousand million, and don't know what to do with them. Most of them were given by people who wanted me to look at their galleries in return (in other words, not genuine).