You might not be an inventor but you can sell to them!

Here is a product that enables you to make a prototype on your desktop. The laser printer sized machine makes prototypes within 5"x5"x5". This may be small in comparison to some inventions but think of all those people who have an idea and just want something to look at to improve, sell, or bring to a manufacturer. The machine is less than $5k, and works off of a regular computer. By uploading a STL file (along with other types of files), and hit "print".
This is just another type of business that doesn't require you to be innovative in a sense. All you have market your services to the right people and give great service.