Big Pharma is thriving off the flu:

http://www.dailymail.co.uk/health/article-5383011/Big-Pharma-thriving-flu.html

Vaccine-makers, pharmacies and drug companies all mark-up flu shots and medications

Profit margins for vaccines are fairly slim, but panic over this year's flu meant that the products drove overall sales up for manufacturers 

Many flu medications, including Tamiflu, are very cheap to produce, and their manufacturers stand to make their money back many-fold