Because part of the reason behind its strength is the fact that it breaks down into more of a glue than a tape. That's why the trick is to only leave it on for just the right amount of time (no more than 4 days for me).

Since most of the other tapes (including the strong ones like ST30, supertape, walker NS, proflex, etc. don't break down, they tend to lift in the nape are after a day or two. The blue liner "melts" and grabs the skin and the piece even tighter as time goes on, keeping it tacked down tight in an area that is prone to lift.

I am experimenting with using some of the other tapes on the nape as well. When they start to lift, I flip up the back and apply white glue to both the tape and the skin, and press it back down once it dries. Not QUITE as good as blue liner, but definitely less messy.