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As you are down voted I wonder: I have the same experience here. Very few serious problems (1/year) that come from developer bugs. Others seem to have much more, e.g. when people ask me if the devs here have pager duty (which they haven't).

I also wonder if we test too much (ca. 85% path coverage, 15k unit tests (3x rewritten), automatic selenium tests, explorative manual tests, automatic API tests, developer acceptance tests).

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It certainly sounds like you're testing too much.

The most efficient use of resources is almost always proportionate allocation between code and other things. So if only a small proportion of your serious problems are code errors then you're either testing too much or not doing enough at other levels of the stack.

The real questions of course are whether your defect rate and the rate at which you introduce new features are where you want them to be.

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