I lighting a lot of peoples DE. The fact of the matter is you need a lot of DE to upgrade the heroes and people will go to those lengths to get as much as they can for as little cost.
For me, this is how I think about it. If you have good enough gold and elixir for me to take in addition to a good amount of DE, I will hit you. But if all you have is DE why waste my army?
On the downside, there have been rare occasions that people lightning me back but heck thats the name of the game
And if people lightning my DE, I wait till their DE is juicy enough and raid them back.