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The basic reasoning behind this is twofold (and benefits both companies). WB - and most DVD distributors - make the bulk of their DVD sales within the first month of a DVD's release, with nearly 75% of sales being made in that time frame. By waiting 28 days to send something through Netflix, they increase their sale revenue, as opposed to losing it to rentals that they can't really cash in on. Netflix, on the other hand, saves on postage by upping the amount of instant video streaming they do. Currently, about 30% of Netflix rentals are new releases, but Netflix heads don't believe the new business plan will negatively affect the company.
John August recently posted his take on the new agreement between Warner Bros. and Netflix. If you're a Netflix subscriber, you might not like the plan. If you're a writer, though, check out John's take on why this might actually be a good thing for you. The increased sales and increased instant viewing selection both benefit writers, who earn residuals from sales and online streaming. Writers do not make money off of discs mailed out as subscription rentals.
The deal, which was just announced yesterday, goes into effect almost immediately, with Ricky Gervais' THE INVENTION OF LYING being one of the first titles delayed. MSNBC has a more in-depth look at the deal.