It matters. Stackoverflow runs a careers platform and ranks users based on their scores. It's opt-in but if you place yourself in there, you'll start getting some calls from recruiters looking for python people. A gold badge is worth a lot on the platform in terms of visibility to prospective employers (it's much more targeted than, say, a linkedin profile). It shows that you are passionate about your programming. Don't let anyone else tell you otherwise.

If you want to quantify it in monetary terms, it's hard to say but it could mean an extra $10-$25k salary per year (due to better negotiating power at the table...).

Source: I've used their careers platform to find some people who are passionate about what they do.