The recent arrest of Russian girl in Singapore due to vice activities have certainly turned the spotlight on them. In a news report, one Russian student, who is supposedly studying English in Singapore, apparently earns about $5k to $11k a week!
Yes, that's a week what she would earn what some people maybe take 2 or even 3 months to earn. Of course, these Russian girls are blessed with good looks, and thus, the demand for the kind of 'services' they offer are quite high. If there are men willing to pay for them, then who are we to argue?