Why would the MSRP for a perpetual NX-OS Essentials license be lower than the 36-month subscription equivalent?

So I'm poking around in CCW here looking into licensing options for different N3K models, and the perpetual NX-OS essential license ends up having a slightly lower cost compared to a 36-month subscription for the same license. Why is that? Why on earth would anyone pay more money for a license with a lower term?