This sale is insane. I went through their pricing and for a full system, OS and all, it's about $5800 for nice cooling, case, high end CPU, 1200 watt psu, more than enough ram and 2x titan Z's, a 240GB SSD,..... that's a really awesome deal.
2x Titan Z's are 6k alone on newegg. If you estimate that the rest of the hardware, build cost, warranty, etc and software comes up to a $1200 - $1500 value... that leaves about $4500 for 2x Titan Z's.
Not bad at all. Ya it's pricey, but it's really not THAT bad. $6k for a PC, if you keep it for 2 years would come up to $250 a month. That's chump change to most people.