It`s a real lottery, someone may have property, stable income, passport full of visas from EU countries (apart from being male) - all the signs that he`s not gonna turn illegal immigrant - and still may not get this visa (b1\b2).
Someone apllies for the first time with new clear passport and receives it.
There is statistics claiming that post-soviet countries like Georgia or Ukraine generally have higher percentage of denials than Russia`s citizens.