Careful, if it gets out that you wrote the code to automate your job as a coder while actually at your job, your company most likely owns that IP.
Yes, in theory. In practice, an employee's power to negotiate wages is limited. At some point, the employee just needs to work to eat/pay rent/etc.
Now, in most areas (of the US), software developers already are paid generously. Even in lower paying secondary markets, software dev are usually paid significantly above local averages.
And, anecdotally, that pay is often for a much "easier" job, where "easier" means less stress and fewer hours than professions that generate similar salaries (engineering, accounting come to mind).
Cause they have more power than you. That's about it.