Membership renewal time

It is time to renew my membership at Proz.com. Oddly, I have to justify an investment on my career to myself. I am holding animated debates on my head on whether I should spend $70 dollars on the six-month membership, or $100 dollars on a year membership. A bigger up-front expense, or a worthwhile expense that will pay off?

Unfortunately, while both sides of my brain argue their valid points, they have zero presentation skills. No PowerPoint slides. No natty suits. Not even a laser pointer.