Ask Slashdot: Paying For Linux Support vs. Rolling Your Own?

schmaustech writes: A lot of businesses pay for Linux support. But at what point does that stop being worth the money? When would a company be better served by setting up their own internal support? When does it make sense for them to write their own patches, which could be submitted back to the community? The inherit risk is that the organization is accountable and accepts the risks if a major bug is encountered within any of the open source applications they are using. What's your perspective on this, and how many major corporations are taking this approach?