The argument that translating requires work, is something I've read quite a few times as well. The counter-argument is that by translating, you reach a broader audience, and are therefore more likely to recieve additional upvotes which an un-translated post would not.

Of course the more-work-argument falls completely apart when it is quite obvious (in many cases) that the original has simply been run through google translate. Proper translation (or localization) does require work, google does not.