How long have you got?
I always am scared of being flamed when I write posts like these, but here goes...
I think school can be damaging and I don't want to risk my children being one of the ones who is damaged by it.
I think that if school isn't damaging, then at least, with parents like myself and DH, it'll be a waste of my children's time.
I think children learn best through an autonomous education and that is impossible in school.
I have a moral objection to coercing children and feel that I can't maintain that stance if I forced them into school.
I like having them at home - I enjoy their company, and I enjoy sharing this very short part of their live with them more than I would be able to were they in school.
I don't want them to be institutionalised, or moulded to fit a system.
I don't want them to feel unsafe until they are mature enough to cope with unsafe-feeling situations.
I want them to be able to follow their interests for as long or as little as they want to.
I want them to be able to paint when they want; read when they want; study algebra when they want; stare at the ceiling when they want.
I think we can't possibly know what children really learn from the things they experience in life - I think what we see is just the tip of the iceberg. I have been impressed at how good my babies, and then toddlers, and then children have been at self-regulating their sleep, food, daily patterns and I don't see why that ability should change when it comes to learning how to be functional adults in their society.
I bet more reasons will come to me later on! What are your reasons then?