Maybe they pay only to few people for improve their reputation little and to "prove" they are paying
It wasn't paying to me too before I purchased another starter earlier yesterday.
I am not Russian or I am not citizen of any Slavic Country. Even my account is of one the older accounts so I already doubled my earnings. I have got 1 pilot and 1 starter contract. There was another starter expired before Bitcoin declines.
Total purchases
499.8500
Contract earnings
980.9071