Most people begin the holiday research process by searching for destination guides (typically through Google). Often, these in-depth guides either don't exist, or consumers don't realise that they exist, on major travel booking sites. By not offering this extra level of information, travel sites risk people leaving and finding this information elsewhere. Researching and booking a holiday is a very time-consuming process and competes with other work and household activities. People have limited time during lunch break and evenings, meaning they're likely to get frustrated if it takes to long too find the information that they require.
Source – UsabilityNews.com