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c/c++ adds to the market value of a dev iff that dev needs it for their job. Same story with every other language. Javascript won't help you get a ruby job for instance. You might consider learning C & assembly, because they'll give you a greater appreciation for what your computer is doing closer to the metal. You don't have to be good, but learning to do at least basic stuff can help you be better with other languages.

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Everything you have said here is correct but I would like to add one thing.

Someone who writes a higher level language (like python, php or ruby) and can understand the internals (written in C not C++) can at times have a distinct advantage.

Not only are you able to/capable of understanding what is going on at a deeper level you now have the ability to optimize things in a way that would not normally be possible. On the PHP side I have used C to do some low level optimization that would not have been possible otherwise, and a long time ago simply get some features to work properly.

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