After querying some Malabrigo die-hards on Ravelry about the yarn's sturdiness (or lack thereof), I have been given a few votes for "single-ply is sucky" and a far greater number of votes for "There are moths eating your yarn."
I only post this in fairness to the company, who do not deserve to have their product besmirched unjustly.
Run. Hide. Now.
I'll be in the kitchen, tucking balls of wool in between the frozen pizzas and waffles.