Why were Russian noblemen always in debt

Nobility, a privileged class, always owed money all over the place - be it to private individuals or the state. How did the richest of Russians always end up in a pit of debt and how - if at all - did they manage to get out of it?

Noblemen in Russia would not find it difficult to understand the situation that numerous modern Russians find themselves in, with their several credits and multiple debt restructuring.