I've updated the Costs page with more info about Europe. It's tricky to figure out, especially with 2 credit cards and 1 debit card, but I've got at least rough estimates. Since I spent such a short time in many countries, I've broken it up into just Western Europe and Eastern Europe.
Also, finally got the number for how much the whole trip has cost: about $17300, for 10 months. So I guess if I had spent the whole year, it'd be around $20 grand. Still, I'm under budget, even with a motorcycle and 3 months in Europe. (It's a little shorter than I thought I'd travel, too.)
I won't argue that everyone can travel the world for a year. However, I will argue that everyone who can save up $20 grand (or maybe $15 grand if you spend less time in Europe) can do it.