If you need to use it professionally then yes, you should buy it.
If you're using it at home then there's no point. I'm not condoning piracy either, just stating the massive gap between theory and practice on the matter.
When you read about people being done for software piracy it's the people pirating huge quantities (usually in Asia) that get caught. If anyone can find me a single instance/story/link where a private individual in England has been prosecuted for using cracked software I'll eat my hat. The money software companies make from private users is peanuts compared to business use. That's where they concentrate their efforts.
I'll understand if any mods want to remove this post but I haven't linked to anywhere offering illegal goods, nor have I told DavidUK how to find such places. I've just stated my personal opinion on the matter.