"This is still a great value when you consider it’s unlimited rental and Blu-ray discs cost about 30 percent more than standard definition discs. Other rental services charge a $1-$2 premium per rental transaction.
Netflix is buying more titles on Blu-ray to accommodate the increasing number of Netflix members who prefer renting movies on Blu-ray over standard definition DVD. In fact, the Blu-ray selection at Netflix has grown more than 60 percent in just six months to more than 1,300 titles, and is continuing to expand quickly.
Blu-ray discs are substantially more expensive than standard definition DVDs – often as much as 30 percent more. More Netflix members are choosing Blu-ray – almost 10 percent now."