If I was shooting professionally and have models to shoot, I might consider it. If I buy that lens and don't have any subjects to shoot, the lens will have minimal use, thus making it not practical just like with my other lenses that have been on idle in my camera bags.
I find myself being critical of what I own, If I don't use it, I'm not gonna have money sitting in a bag. 6-7 lenses I will use regularly is all I'll have/keep.