I like pink yarn. The color makes me happy for some reason, especially if it has bits of other colors in it. Maybe it reminds me of my favorite ice cream, peppermint stick.
I like wool/silk blend sock yarns. They feel nice sliding through my fingers as I knit.
I like buying yarn when it benefits charity.
If you like these things, too, head for The Unique Sheep and get some of your own. The yarn in the picture is the colorway Hope in the 25% silk/75% superwash merino Luxe. They've got another pink color and other weights and yarn types, too. Half of the sales of those colors are donated to the Susan G. Komen Foundation.