Fred,
I'm sorry...gross sales/gross profits does have uses; you make very valid points. I just think it can be deceptive, too. If it's all a person considers, some very damaging decisions can be made. Maybe $1/2 million in annual sales means the owner could expect $27,000 in annual salary, but maybe he thinks he can draw $100,000 per year because he sees that big $1/2 million annual sales number.
Or maybe the annual sales are $70,000 and the owner thinks he should be making a descent living, but, in reality, the owner never seems to have two nickels to rub together for his business or his personal life. He might stay confused or wrongly blame his employees for his troubles (which will cause even more problems), if he looks only at gross sales or gross profit.
In the worse case scenario, the business loses money on every sale, therefore the higher the sales the worse-off the business is if something isn't changed (prices, expenses, business closes, something). My dad was partners in a janitorial company for 6 months. At the end of the six months, they went over the books. I forget what the sales were for that time...say $10,000. Dad went over everything and determined that they had lost $5000 (I think that was the figure) over the 6 months. Dad told them that they would have been better off to have taken $5000 and throw it in the garbage because at least, in that case, they wouldn't have had worked so hard. They thought he was nuts because they could only see the gross sales amount. He left the partnership immediately.
Now, a person who knows about inventory turn-over, etc. (stuff, which, honestly I have completely forgotten), isn't likely to be decieved by their gross sales number and will use the information properly.
Just some thoughts...and you might still disagree...and what I say is based mostly on how I FEEL when some people talk about their gross sales numbers and a few other instances, perhaps...it isn't based on years of running a sucessful business, which you have done.