求教一道逻辑题

Surveys show that every year only 10% of cigarette smokers switch brands. Yet the manufacturers have been spending an amout equal to 10 percent of their gross receipts on cigarette promotion in magazines. It follows from these figures that inducing cigarette smokers to switch brands did not pay, and that cigarette copanies would have been no worse off economically if they had dropped their advertising.

请问大家黑体的那句话怎样翻译才准确呢?

谢谢