We understand that information has a fundamental characteristic of being useful at the moment you request it. Yet information is worthless if it is wrong. Most online public information companies update their data on an annual or quarterly basis. Regardless, the data used to update the systems is likewise outdated in many cases. It means that the records and information you seek through fast-food sources could be incorrect, false, and misleading to your purposes.
Every search involves the human intelligence factor.
Simplified, this means a person, or team depending upon the request, conducts research on your request. Each search is custom made and tailored around the client's needs so to speak, compared to assembly-line and mass produced information that is built around the database company's needs. Data requests submitted to an online company involves no human interaction, as you pay a machine for its limited intelligence capabilities. Likewise, the human intelligence factor is absent from information brokers who resell the data from the online companies. That real person is not a college student on Christmas vacation, but a trained professional.