Artists will do whatever it takes to sell their singles + albums. It's not unfair if one of them decides to discount their songs or release an 'remixes E.P.', considering everybody is able to do that. It depends of the real intentions of the artist/label. Rihanna managers, for example, decided to discount Only Girl the week it went #1 on Billboard Hot 100, besides the lost of money, because of their interesting on having her breaking another record.
Some of you act like that is a bad thing, while others act like your fave doesn't do that, but they all do. Believe the user with the hottest avi on ATRL