Because it's hard to define good C++ code. Many people would consider STL and Boost code to be good C++ code, but good luck trying to read through it.

It's probably because there are lots of non-C++ programmers who are curious about C++.

Plenty of examples at this time.

It seems that your comment follows the usual HN comment pattern. That also speaks for itself.

There is no such thing as good C++ code.