If you want to sell your efforts producing software you are going to be spending most of your time doing sales and a minority of your time writing software. Too many developers have this idea that people should just throw money at them while they have fun crafting some OS library. We could only be so lucky!

In reality only a small minority of open source projects (the type that are near ubiquitous) garner enough from donations to fund the project. So you have a choice: become a salesperson first, or treat your project as a hobby and don't kill yourself working on it.