There really is no correct answer to that question. It depends really on the products involved. You could very easily make more money on one product if it is in fact a high quality product. And of course promoting five quality products would be better than promoting one.

The real trick is to find which products are going to be profitable. If you’re not sure about which products are going to be winners you may want to test 5 or more products to see if you can profit on any of them. If during testing you find one or more products to profit or even break even surely you could optimize those campaigns to become even more profitable.