There's certainly an amount of tacticool involved I'm sure but for many (I for one) it's more to do with comfort and ankle support. I'm not a big rufty tufty ex soldier so I don't have the fitness to not notice the weight of heavy boots nor do I use my boots enough to batter them into submission so they need to be light and flexible from the off. I used to use my old work Magnum Patrol safety boots but I found that whilst incredibly comfortable they got heavy by the end of the day (steel toecaps, see). hence I started doing the self same thing plenty of folks do and got sucked into the "must buy super leet Zephyr GTX nothing else will do" thing. Easily done really. Having said that at the time the only boots Viper were doing only came in multiglam (just not me) and decent Magnums have got expensive. So much so that when I managed to find a pair of Sawtooths on ebay from the US they weren't much pricier than a high end pair of Magnums over here.