Great Article Robert!
It's interesting that according to this article, Getty's very strategy is the reason they won't sue.
They appear to go after very small businesses and individuals. The costs of filing suit are generally higher than the extreme valuations Getty asks for one or two image infringements.
And, if Getty were to prevail in a suit, the chances that they would ever get paid are slim because:
To make matters worse, in the U.S., many, if not most, legal judgements can be discharged in bankruptcy.
Personal bankruptcy might be hard to justify, but if you really don't want to pay those guys, I'd bet you could find a way to put your small business through bankruptcy, and open up with a new shingle the next day.
It might seem extreme, but if you really don't want to pay the trolls, you can find a way around it.