I would say it's extremely useful -- most establishments have a general idea of foot traffic (ie: POS transactions or qualitative visual assessment) whereas with density.io you have a detailed history of when and where there's foot traffic.

Why would someone want to know this information? Ideas abound! I don't think we've had such easy measurement and monitoring at the fingertips of the general populace.

Having detailed logs of user growth is invaluable (the much-vaunted hockey stick), however this level of granularity is unavailable in the physical world.

Now we can show interested parties that, for example, our storefronts are hockey-sticking, growth is high and projected to grow higher, etc. You get the idea.