OG12 逻辑第38题，求解，多谢

Which of the following best completes the passage below?
The computer industry’s estimate that it loses millions of dollars when users illegally copy programs without
paying for them is greatly exaggerated. Most of the illegal copying is done by people with no serious interest in
the programs. Thus, the loss to the industry is quite small, because .
(A) many users who illegally copy programs never ﬁnd any use for them
(B) most people who illegally copy programs would not purchase them even if purchasing them were the only
way to obtain them
(C) even if the computer industry received all the revenue it claims to be losing, it would still be experiencing
ﬁnancial difﬁculties
(D) the total market value of all illegal copies is low in comparison to the total revenue of the computer
industry
(E) the number of programs that are frequently copied illegally is low in comparison to the number of
programs available for sale
答案是B，但是不明白the sale lose 与 purchase，有啥关系？OG给的解释我没太读明白。多谢解答，谢谢谢谢！