Except something like 90% of revenue comes from 5% of "players" so it's obviously just what he told himself to placate his conscience that he wasn't ripping off addicts.
This whale principle certainly seems to cover quite a bit of the economy.
Even movies are similar. You want to spend a million (or a few) on star wars ? Not a problem. [1]
From a psychological standpoint I would strongly suggest that you never make it your mission to save people from themselves. There's only 2 ways you come out of that experience: evil (lost belief in mankind, and therefore anything goes), or mad.
[1] http://mentalfloss.com/article/53388/6-most-expensive-pieces...
You cannot let your life be controlled by "ethics" like this. It's not reasonable.