I'm guessing you meant to put a "?" instead of a "." at the end of your sentence, but to answer your question/sentence (?), because it's an unnecessary cost to the company (which will be passed on to you as a customer) when whatever system was installed would soon be ripped out and replaced. Deal with it, enjoy your iPod/laptop/whatever for the rare few flights without IFE (and the fact that you get to your destination safely, which, is the point of an airline, not to entertain you), and then enjoy DirecTV once installed.