As expensive as college is these days, very few people can really "afford" it anyway. Personally, I will absolutely make every sacrifice in that area for my child. But not because I owe it to him, or because I love him more than other people love their kids. I home school too, for similar reasons.
You know though, I cannot say that my financial support for his college years will be unqualified. What is in life? With the money will come responsibilities.
When have I said parents don't have a choice in whether or not to pay for their kids' schooling?