The reason I say it's a joke is that used properly, a BAM army profits DE and doesn't burn it. I farmed DE at TH7 with BAM and maxed my BK and I would have completed all my DE troops but the rest of my base was maxed so I went to TH8. It just takes some practice and learning to pick the right base. You'd be surprised at how many bases are so poorly designed that a th7 with some minions and 1 rage spell can get to their DE storage.

