来源：SEO drives 75%+ of all search traffic, yet garners less than 15% of marketing budgets for SEM campaigns. PPC receives less than 25% of all search traffic, yet earns 80%+ of SEM campaign budgets.
搜索结果的排名曝光度对比：
| 自然排名的可见度 | 右侧付费广告的可见度 |
| Rank 1 – 100% Rank 2 – 100% Rank 3 – 100% Rank 4 – 85% Rank 5 – 60% Rank 6 – 50% Rank 7 – 50% Rank 8 – 30% Rank 9 – 30% Rank 10 – 20% | 1 – 50% 2 – 40% 3 – 30% 4 – 20% 5 – 10% 6 – 10% 7 – 10% 8 – 10% |
最后，SEO是廉价劳动力吗？SEO创造的价值那么大，为什么被获得的认同却很低呢？难道非要自己当老板不成？……
