How to provide a demonstration of WordPress for new customers

Interesting; I have never done this before. I preferred to create ScreenCast videos.

I don’t see any better alternative to using Cron Job for automation of database reset. Here is the link I found that may help you:

• How to reset MySQL Database using Cron Job
• Automated Reset of MySQL database to fresh install

Here are a few WordPress-specific links that may prove helpful to you:

• How to reset WordPress database to default settings
• WordPress Database Reset (Plugin)