[nanoGeek]

In this life very few things are black and white. Getting a gold badge in Python is not as great as starting the next Facebook but it's definitely a clear sign that you know your stuff.

I think your badge is worth much more than $3, but it's very hard to value how much money it's worth. Think about it: how much money is worth getting a GPA 3.7 vs 3.3? How much money is worth meeting Zuckerberg and talking with him for 30 minutes?

Getting a gold badge in Python will not result in a rise on your salary alone. On the other hand having this badge proves that you know your stuff. It's clear how competitive StackOverflow is. If you ever decide to move to another company it will definitely be seen as a positive sign when they look at your CV. You may get an interview thanks to the badge.

So, to sum up, with this badge and some luck, you can work at a better company (and this means higher salary). On the other hand, don't expected a rise from your boss.