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It would be WAY too easy for DIY'ers to seriously abuse/misuse the application of it.

That holds true for almost everything electrical-related that I've seen either directly or courtesy of this forum.

NM cable being connected to male and female cord-caps to make extension cords.

Handi-boxes being used as portable cordsets.

Circuit breakers with tie-wraps shoved into them.

Fuse-holders bridged with tin-foil, a piece of 12AWG wire. Screw-plug holders with slugs.

Extension cords being passed through holes in the wall or roof and wrapped on trees.

"Repaired" paper-lined metal-shell lampholders that have had the interior mechanism wrapped in MASKING TAPE because the original cardboard shell rotted away (I still have it around here somewhere). [Linked Image]

The list goes on.

Also, keep in mind any DIY-er can buy from an electical supply house.