As far as I understand and from what I heard in shul, is that the miles earned although you can argue it's not taxable, however it's considered income in regards to benefits, especially when they can proof it was done on a large scale and consistently.
Overall the six couples from last week and the 3 from a week before is not such a major case, and it wouldn't make the headlines if not for the first round, where it was a first degree federal crime, and more money involved.
Plus the fact that app.com just blow it up for what ever reason. (I let everyone figure out the reason)