What money? They have lawyers on payroll and filing fees are minimal. Their direct outlays so far in the three figures.
And I don't get what "following through" is supposed to mean? Trying to convince a judge that someone who got $5 for posting a review on Amazon encouraging people to buy from Amazon has damaged Amazon's business and should pay $XXX because of it? Multiplied by 1,000 defendants? That would be the laughable part. And that's the part Amazon won't be doing.