Providing free or cheap personal use is the best marketing for complex BtoB products.
Eventbrite lets you use their high-end event registration tool for free for your personal events or parties. They make their money charging a commission for big events that sell tickets.
Every big business event planner gets to fall in love with the free version, which is (of course) the one they recommend to their company.
Same thing with Salesforce.com. You can use their amazing platform for personal use for just $5/month. And you’ll be a die-hard advocate when your employer is considering a 6-figure license.
Lesson: It costs less to give the product to a prospect than to sell it to them.