You have a point regarding pathological users, but this promotion also draws in people who might have already played or heard of one or two of these games, and

You have a point regarding pathological users, but this promotion also draws in people who might have already played or heard of one or two of these games, and are willing to drop $30 or $40 to check out the remaining ones. Also, even a cost of $1 incurs the friction of the transaction. That ought to turn away a significant percentage of the freeloaders, who probably paid 0 on pirate bay a long time ago anyway.