Is a neck rest necessary?

[Jim Figurski]

I was wondering if a guitar neck rest like the rock-n-roller from StewMac, or the kind that Dave from Dave's world of fun stuff is necessary for luthier work.  Is it? will the neck become warped or something if you don't use it when laying the guitar on its back?

[Hesh Breakstone]

The sequel to 50 Shades of Gray is out, maybe we can get some guitar vice ideas there.......