It highly depends on the Dark Elixir (normal) Elixir 'exchange market' (aka cost/benift situation with raids). If there is easy zapping access, an abundance of normal Elixr, and Dark Elixir is in high in demand, people will be willing to Dark Elixir zap, period.
Supercell helped with this issue by giving a Dark Elixir Drill to TH7s (BTW THANK YOU!!), and a second at TH8 (DOUBLE THANK YOU!!), but I still did DE zaps because of others raiding nearly a day's worth of drill production. Why? I made enough Elixr to do it, plus
it was the only (arguably) viable way for me to revenge attack TH9s that regularly hit me.
Mind you, I totally understand how getting zapped for 800-1,500 DE with no other physical attack with troops feels like a violation of the assumed spirit of the game. But until something better comes along, that's how the game plays.
Note: You do not solve the cause of the DE zapping by covering up the symptom of the actual act of zapping. Might as well try to punish people with exposed Town Hall bases while you are at it.

If the first several times the 'simple zapping fix' didn't work, why would repeating it several dozen more times have a better chance?
(Spoiler: it doesn't)