A big question as the Blender Market grows is what will be the most popular type of product? I've had a hunch since the beginning that the most popular category of products, based on number of sales, would be add-ons. So far this is proving to be true. As it stands right now add-ons account for around 6% of the total products but they make up approximately 64% of all sales. This is quite significant. I believe there's good reason for this too. Add-ons, perhaps more than any other product, are basically tool upgrades. They allow us to do more with Blender, and often do it more easily and faster. Add-ons also have a much longer lifespan. A single add-on may stay in your workflow for months or years, while a model might get used once for a specific project.
Here's how the product categories stack up, by number of products and then by number of sales.