charro callado wrote in post #13499975
The relevance of that kind of information is highly questionable because the definition of "professional photos" is not a precise one at all. Professional does not mean good, and vice versa.
Bottom line, your potential clients are not going to want a math lesson. Most will know intuatively - just by looking at your photos - whether or not you are going to add value to their business. Those that don't know are not going to be won over with a chart.
+1 to this. So much depends on the photographers skills in that particular field. In addition, it also makes a huge difference what the product is. The photographs above the counter at a fast food outlet are vital to sales, they are what people use to decide what they want to buy, they are shot by specialists in food photography where you need to know how to present the food, as much as lighting it etc. Sales would drop to nothing if they just put up photographs which actually look like the burger you are going to get, and they would quickly be out of business.
Now, consider a discount store selling cheap goods. People will wander in, browse the shelves and choose from what they see. The store doesn't need catalogues or fancy images and professional photos will have very little impact on sales.
So, any generalised statistic that you come across will be meaningless in the specific case of YOU as photographer and the potential clients business. You need to come up with some more specific reasons why YOUR photography will increase THEIR sales, and those may change from pitch to pitch, depending on the business you are dealing with.
If you came to me, I wouldn't care less about the national average sales increase of xx%, as I would know that it had little relevance in my specific case. However, show me some images, tell me what you would shoot for me and describe how I could use them to increase my sales, and I would pay you some serious attention.