When you sell a variety of goods or services, you’ll probably find that one or two of them will emerge as your big profit-makers. The tendency is to focus on these cash cows and neglect the introduction of new products. While it’s understandable to want to profit from the winners, be careful of committing all your resources to milking the cash cows.
Markets change, and you don’t want to be left with nothing appealing to sell.
Don’t get caught short if your cash cow dies. They don’t live forever.