Well, once someone converted it to dollars and started comparing it to costs in the US, it kind of opened the topic, don't you think?
Also, according to both the link you provided and the income inequality page by country, the US and Russia are on par; they both have Gini coefficients of 85-90, and PIP (poverty & inequality plaform) indexes in the 35-40 range.
Which metric did you see that says Russia's wealth inequality is worse than the US's?