Information products can be produced in any quantity - it is as simple as copying a file. With information products, inventory and the problems around keeping an inventory are completely eliminated. With information products, shipping costs and problems around shipping are completely eliminated. Because it is delivered electronically, the time-lapse between purchase and delivery is neglegable. The advantages are enormous.
Hard goods have to be manufactured from raw materials and with machienery.
You'll probably have to hire someone to oversee the production. You'd have to have a system for keeping inventory - and again someone to run that. These overheads make it difficult to be competitive. Information products are cheap, easy, convenient and fast . The kind of thing you can create and sell all by yourself.