Unfortunately not everyone is sensible enough to see pass the marketing smoke and mirrors, and they are willingly throwing £200 extra at Nvidia simply because the card has been labelled with Titan branding...
But hey...it's business. Personally I wouldn't really care about people throwing away more money than they need to as it is their money and has nothing to do with me, if not for the aspect of getting a slower card than I should have for the money I am paying due to the artificially inflation planned and caused by Nvidia that's getting to me the most.
I'd probably be stucked with AMD and has no hope of ever returning to Nvidia, unless I want to wait for Nvidia cards that's way pass EOL like the bargain GTX780Ti deal right now.
Perhaps some of those buyers bought the card because atm is the fastest and its what they wanted and would have done so even if it wasnt called a titan, , Unless ofc you know of another single gpu out there atm that has the same performance for £200 less?