[fizzynut]

If ever you work at a place where the software does not make money or is treated as such then you should consider leaving. You will be treated like a cleaner, i.e. it doesn't matter how well you can clean the office if it has zero impact on revenue, they just want the cheapest.

Everywhere else, your worth is the value you generated multiplied by the number of people it interacts with.

The closer or more direct the path is from the work you do to the value generated, the more you will be valued in that company. This is why Sales can be valued so highly, but if you implement X to win contract Y worth Z where Z is a very big number, your worth is quite clear and it's obvious you should move on if you're treated as a cost in such cases.