Ha, yes... WoW for sure, like a lot of people. 9 years (roughly) times 12 months times 15 bucks is, what, $1620 right there. A couple of collector's editions, a couple of regular editions, that'd be, say, $250 (AU). Quite a few realm transfers (much respect to Blizz for refunding some of these years later when they introduced Australian servers), one or two faction changes, I'd say that'd add up to over AU$2000 at the very least.
For one single game? Maybe $120 for a rather rare PSX game that I probably got ripped off over anyway. Although now that I think about it, there were certain Mega Drive games that were massively expensive back in their day. My memory is hazy, but I'm sure I paid something like $140 for Streetfighter 2. Probably that had a lot to do with exchange rates during the 90s, but whatever, it surely wasn't cheap.