Shame on me. I finally succumbed to purchasing my first Team Fortress 2 item several weeks ago. I justified the transaction by wanting to pad out my Steam wallet with £10 so I could buy A.I. War, while still having enough change left to get my grubby mitts on a vanity item of my choosing. Having sunk hundreds of hours into TF2, absorbing its free content like a sponge in water, I told myself it’s …