When you buy a downloadable game, you take the ability to redownload it for granted; sadly enough, this is not the case when purchasing from EA Store.
After adding a game to your EA Store cart, you'll be presented with an option to buy "Extended Download Service" for an addition $6.99. EA explains the extended download service, saying that it "means that with the purchase of your digital product, we'll keep a copy of your file for two full years, so you don't have to. You'll gain peace of mind knowing that we have your program stored and ready for you to download again at your convenience."
Needless to say, EDS costs EA exactly nothing as they already have to store all transactions in their financial records. The real question is, why would anybody buy EA games from EA Store, given that they are already available on Steam without extra the fees and limitations.