Oh there is no doubt that Apple sacrifices market share, but the two questions were not connected.
My thoughts on Lenovo were simply that if they can offer up 20-30% discounts 'all the time' they are over-priced in the eyes of their target market and can't hit the sales numbers required. They must have better than discount mark-up or are selling close to loss.
More interesting than making any real point.
It is an interesting discussion and Lenovo has an interesting philosophy regarding their use of promotions. They claim that through Promotions they can increase awareness, brand building, targeting customers, etc. and if priced to low they will risk a drop in brand image and positioning and if priced to high they will lose customers to Dell, HP, Asus, Acer, MSI and others.
Apple is in a unique position with no competitors in the MacOS market. They can maintain whatever price they wish to maintain brand image and positioning without fear of losing customers to another MacOS competitor. I wonder how Apple computers would be priced and marketed if there were dozens of other manufacturers selling MacOS based laptops? Would they have sales? promotions? eCoupons? We will never know.