Mixed group of millennial aged friends discuss investing and cryptocurrency trading at a cafegettyCovered-call strategies can be an income investors’ best friend. Whether the broader stock market goes up, down or merely grinds sideways, selling covered calls pays.Fortunately, we can buy covered-call funds that do the heavy lifting (“call writing”) for us. These funds yield 7%, 12% and yes even 89%. We simply buy them and collect the dividends.But are all covered-call funds good buys? Of course not. We’ll so ...