Maybe they should but, and when you read this remember that this is speculation on the Finance and Marketing crew of Nvidia.
They most likely believed that by dropping the price from $1000 to $750, they wouldn't sell too many more cards. This is called Price Elasticity, I'll give an example real quick:
At $1000, they believed they'd sell maybe 10,000 cards. $10,000,000 revenue.
At $750 they believed they'd sell maybe 9,000 cards. $6,750,000 revenue.
Price Elasticity is (Change in Price)/(Change in Demand).
From wikipedia "Some luxury products have been claimed to be examples of Veblen goods, with a negative price elasticity of demand: for example, making a perfume more expensive can increase its perceived value as a luxury good to such an extent that sales can go up, rather than down." - I won't say this is the case for Titan at all, and I do believe raising the price decreased demand, but I believe that it's Price Elasticity was VERY low meaning raising the price decreased demand by not too much allowing them to reap more revenue. Once you hit ranges where products are considered "luxury" or "premium" changes in price have a much lower hit on demand. In contrast, if a mid range product of AMD or Nvidia changed even $20 dollars, we'd all change our recommendations immediately. A $20 dollar jump in titan's price though, and it really wouldn't matter.
Hope that helps.