Most homeschooled kids have parents just like me. I know where I am weak and I get extra help for those subjects. For science, I have found an retired NASA scientist who loves teaching homeschooled kids. For upper level math, I am using a video program and my son is regularly scoring between 89 and 95 on his algebra tests. I can't teach violin, so I get a private teacher, who's own daughter is now studying at Julliard. For art, I have found an artist who teaches out of her home who on the side sells her artwork for upwards of $25,000 per piece.
As a homeschooler, I have many more options for my children. I can zero in on my children's interests without any interference. I don't have to wait for some school official to take note of my child. I don't have to work with ANY middlemen.