AGNC Investment has a shockingly high 14% dividend yield; make sure you understand the risks before buying it, thinking you've set yourself up for a lifetime of income.AGNC Investment (AGNC 0.29%) has done a fairly good job of meeting its long-term business goals. The problem for investors is perception, because the stock's 14% dividend yield can obscure how the stock is viewed. Here's why AGNC Investment, despite its huge yield, may not set you up for life if you are a dividend investor.What does AGNC Inve ...