Enterprise support is what you need when you're selling $3,500 towers because that's the where most of the sales come from. Not many consumers drop that on a PC.
I don't see the connection. Not all statements about Apple are wrong because one is. Apple sells about as many desktops to enterprise in a year as the average Best Buy and this is probably part of why.
My point is that most companies, like Dell, sell their consumer machines at a horrendously low profit margin. They make it up in enterprise sales.
Apple, however, sells consumer machines at a tremendous profit. The value you think Apple should see in enterprise is negated by their own business model being different from the industry norms.