For me its also a promotional step for any author to make some of his book free in the sites but later on when it gets popular, gets to charge. Its their prerogative. You would be lucky to have got it free but a bit unlucky if you see it later to have a bit of charge if you download it later. Some authors also gives away free access to one or two books but later books which are deemed better and have better reviews are now with certain charges to download.
You win some, you loose some. But just looking at these free ebooks to be blessings.. As they say... better have than none.
