Historically I have been a buyer when using Freelancer (and it's predecessor) however I do have skills in 3D cad,and the ability to visualize conceptual ideas then turn those ideas into real functional objects.
The challenge of solving how to make something work either more efficiently and/or something that has never been done before is extremely fulfilling. Seeing an idea become reality is very satisfying for me.
For physical prototypes I use vacuum forming, a lathe or a contracted SLS 3D printing company to make Custom Spinning Tops, Fidget Spinners, Unique Foot Scrubbers, Various Types of Gold Mining Equipment, and lots of Gadgets. I'm well known in certain hobby groups for inventing things and have websites, FB, YouTube etc... I also design games but get others such as from freelancer to do the programming.
Money isn't my main motivator for designing so I'm a bit picky what I work on. I have the attitude that if I do work on something it will be the best in the world.