Should homeschoolers be concerned about grades?

This is a good article by Michael Mclaren concerning grading in your homeschool. For us grades were never really an issue. We weren't concerned about them and grading work or activities seemed irrelevant. Once in a while our children would be curious about a grade system because non-homeschoolers would make such a fuss over them, so we'd total up a few pages of book work just to show them what happens in a public school setting. Besides, we were always too busy learning and having fun to worry about grades. Grades weren't an issue for getting into college either. Both of our children entered community college without a high school diploma, SAT scores, transcripts or a GED. If you think about it every homeschooler is a valedictorian so why bother to keep score?