No matter what Nvidia themselves say this isn't a gamer targeted card. It simply doesn't make sense for a gamer to buy, they are far better off with GTX980's in SLI (which outperforms the Titan X in gaming benchmarks significantly).
Lacking in DP performance does make it less attractive to most GPGPU researchers, but some cases do just fine using SP and most graphics related research certainly does. So let me reiterate: if you are working on research for next generation games and you are working with massive assets that may or may not be compressed down in the future this card is interesting. If you are doing other graphics research in raytracing or voxel cone tracing or the like then this card is interesting.
Of course some of these cards will simply end up in the hands of gamers with more money than sense, but I imagine the majority will find their way into universities in the hands of researchers who need large amounts of onboard memory and high amounts of single-precision performance. Not a big market for sure but I doubt that any of the Titan line of cards are really profitable on their own anyway, they exist primarily as PR for Nvidia (which is why they are always surrounded by big PR events).