Another can use is to keep an eye on particularly vulnerable packages, which can be dropped in favor of alternatives with a better security track record (e.g. gcj over openjdk, chromium over webkit).
Failing the above, one could use any remaining motivation along with debsecan to determine which packages one wants to fix themselves; preferably followed by uploading that fix to something like debian-mentors  so that every debian user can take advantage of that good work.
And maybe one day that work results in becoming a debian developer, as in my particular experience.
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