As a self-identified HODLer - I like to think it's because holding isn't nearly as easy as it sounds. Ignoring what 'Mr Market' is offering you for your property on any given day and overruling your herd-following instincts is not easy, else Warren Buffet wouldn't be such an outlier.

And yes, the HODL mantra is a way of reminding myself that I shouldn't make emotional decisions in the heat of the moment.