[lionhearted]

I thought the same thing, but they probably give away a free product sometimes, which is technically 100% off.

I actually thought it was a good slide since I went, "WTF? ...oh wait, yeah, that could be right" - good way to wake up critical thinking type people and get them paying attention if they were zoning out.

[underwater]

It made me think they were either bad at math or exaggerating.

If it's used in the context you're suggesting then it's a meaningless snippet of information as it doesn't reveal anything about the typical user experience.

[marcamillion]

Agreed. It's bad math. Even if they gave away something every now and then, it definitely does not explain 100% off. They would have to give away everything and make money some other way (say shipping) - which could be plausible, but I don't see it explained here.