What do other pots cost?
For me, a storefront counts for something. I don't want to go to other sites, where I don't have classifieds access, to find a guy I don't personally know, to buy a pot that no one I trust has used, for a price that may only be quoted in forums posts somewhere. Time is an issue, sometimes more than convenience/money.
The biggest part of my decision making process was where do I go to buy it, then do I know what I am going to get. I don't know that any top tier pot costs less than 200 bucks, so not something I want to gamble on unknowns with... and I had used an f1ee before and seen the Koolance struggle under load in comparison.
Not saying kingpin is the only way to go, but these are the reasons it made since to me. And I could get a gpu pot from the same place, which I also knew was good at holding temps.