because its like a shop selling a can of beans for 25p to one class of customer and 15p to another class, I believe this kind of practice is illegal and is against open market laws. This is probably why other isp's allow residental customers to sign up to business packages.
Business Lite is cheaper then residental not sure where you getting your info from.
http://business.ntl.com/product_solu...band_lite_1500
"4. Why? NTL are marketing a residential product which is aimed at users with a specific usage pattern. If the product doesn't suit your needs then look for one that does."
I was looking at one until you told me I wouldnt qualify for it, due to some stupid clause been added to it.