They don't give a flying frack for anything other than your naivety for giving them more money.
You want to help the industry, promote anti-piracy. Throwing away your money gives further evidence to these people of how gullible gamers can be.
I can see your point of view. Most of my friends pirate and I try to convince them to do otherwise.
I know it's probably pointless and will have zero effect but I felt bad for Crytek and thought it might help, not financially but for morale.