Exactly. I could even go as far to say that manufacturers benefit from piracy. Why?
No they don't. Your example basically illustrates that.
Say, you are starting out, and have the choice between PS and Corel. You choose PS because it's easier to crack.
Then, when you go pro, or your concience catches up to you, you will buy PS, because that's the program you have used for the past years!
Corel Paint Shop Photo X2 doesn't really compete with full blown Adobe Photoshop. It's £56 for the full suite while Adobe charges hundreds of £££ for Photoshop. In an ideal world, Corel would be the choice for people who could not afford full blown Photoshop and didn't pirate Photoshop since how can Corel compete against a product that is undoubtably better, that targets a different market, yet eats into your market because it's essentially free.
Piracy essentially solidifies the position of monopolies and makes it practically impossible for new comers to break into the market. Going back to your example, companies like Adobe and Microsoft don't really mind piracy that much since as you've noted it benefits them in the long run. On the other hand, it's quite difficult to argue that it help out the little guys.