The quick answer is visual learning gets processed 60,000 times faster than text.  Because an animated explainer video can clearly illustrate your service or process in less time you have a better chance of keeping your viewer engaged.  And since your viewer is engaged faster, you have a better chance in conveying your product or service.

An animated video can also take complex ideas and quickly explain them.  Thus freeing up time during business presentations and consultations.  Take complex processes and cook them into a entertaining visual/audio presentation and now your audience can be educated in a 10th of the time.  Most business presentations can also be modified to become excellent sales tools on their own.