Actually, and here is the con.....
I'm not really sure we OWN any eVersions of things we buy online like this.
If we OWN them, then we can do what we want and sell the items we OWN or give them away to others as they are ours.
I think perhaps you may find, unlike when we buy a real book, a real CD, a real BluRay/DVD a real computer game on a disk. We are paying, many times, the same price just actually rent the item for our own personal use.
Although the same can be argued with physical media in that we don't, for example OWN the song, we only own the right to play it.
The physical item is our property to do as we with with.
So, we are allowed to sell or give away our old Books, CD's, DVD's, Games that we no longer wish to have, and get some money back to put towards fresh purchases if we wished, or, as I say give away to charity shops.
Which is why I and many others feel that eVersions should be priced significantly lower to reflect this.