It would be good to believe that they will be effective, but so far we have little proof. A vendor’s testimonial that nine out of 10, or 99 out of 100, customers are satisfied with the results will hardly be convincing, because those who fail to improve will have less interest in participating.
那么如何为这些服务付费呢？在初始阶段，早期使用者会直接为大多数软件和服务付费；其它的则由广告商提供赞助。虽然乐观地认为这些软件都会最终变得高效实用，但目前我们现在还拿不出什么证据来证明这一点。一个服务提供商即便是声称90%或99%的顾客都对服务结果满意，也可能没多大说服力，因为那些对服务结果感到不满意的人往往都是回避调查的。