Covered call exchange-traded funds (ETFs) are not new. But the obsessive buying behavior and “can’t miss” attitude investors have developed around them is. These ETFs have a simple premise.They buy a basket of stocks, either based on an index or active management. That gives them equity-like returns but also equity-like risk. And, since major stock indexes typically produce dividend yields of under 2% these days, a generation of investors seeking retirement income and or other cash flow have flocked to th ...