One company I was at shipped a hardware product. The hardware would come in from the manufacturer, the techs on site would flash the firmware, apply stickers, and ship to customers. When I started they were shipping 10-15 boxes a day (this was easy to judge, they sat by the entrance and the UPS guy would come in and get them). Then a few month later, the senior sales guy left, and a new vp of sales was brought in. Over the course of a year, outgoing devices went to near zero. That's when I started looking. A year later the company was still alive, but limping with a skeleton crew of devs and techs. Most who stayed were fired.