why most of btc users are russians? 
and why most of russians are scammers?
and why most of russians are scammers?
I guess this is somehow related with Mavrodi, founder of MMM that live in Russia. He's influential enough and eventhough he did scam Russians before there are still people who trust him and his program.
you are right, since MMM using bitcoin, this may very big influence. I also wonder some of my facebook friends are still investing in MMM, it's obvious they make use of a ponzi scheme.
but even mavrodi had been recorded getting prisoned a few years back won't make they stop from joining it,I could say it's what everyone called "Greediness."