The benefits I can think of from commenting out apt-src lines are: - Faster installation time, doesn't have to download Sources.gz. - Marginally faster apt-get update time. Now that apt in unstable uses diffs, this is unlikely to be worth commenting them out even for dialup users. - Slightly less space used in /var, useful if 5 mb matters.
I'm not convinced this is worth breaking least suprise, which expects apt-get source to work. -- see shy jo
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