This has always been a great question, and there are many different schools of thought on this subject.
A person could argue products like software, eBooks, and virtual information are amongst the most marketable as they are easy to duplicate and have no shipping costs.
It’s true a virtual product can absolutely simplify your post-sale process, however are they truly the best overall product strategy?
In my opinion it all comes down to the demand, then the numbers.
Calculate what price you can create or retain a product for, and then calculate what price you can sell it for, keeping in mind advertising, shipping, and other expenses that fall between those two processes.
“Determine what your total costs are from start to finish”.
I wouldn’t even consider selling a product or service that fetches me any less than 80% gross profit per unit, unless it had a great backend or up-sell strategy, or some type of recurring subscription based profit model.
And then promote this product using an email marketing software to keep in close contact with your warm market and new potential clients.