Sure there is a value to it. For instance if you want it to curl like a roll brim hat or the neck, sleeves and bottom of a sweater. Or you could create a partial curl for ruffly effect..lots of uses.
I should also point out that if you are knitting with acrylic or mostly acrylic blocking won't be permanent and it may or may not work as well as wool. And don't steam it as it "kills" the acrylic unless that is the look you want. Blocking by using a wet towel or spray bottle and then pinning it out will get it flat enough to seam more easily.