Because I'm a professional alpaca farmer. It's what I do for a living.
lol JK
One of my hobbies hiking. I frequently do day hikes so it's very important to have good moisture wicking clothing so you can stay cool and dry outdoors. Merino wool is one of the most popular fabric for socks outdoors but alpaca wool has slowly starting becoming a popular in the outdoors comunity because alpaca wool is softer, stronger, warmer, retains less water than merino wool.
So I'm switching over to alpaca wool for socks and sweaters