Wait a sec, how was exactly you "lose" your money while trading on yobit? You bought on higher price then you sold it on lower price?
This is too visible bro, if you know YObit.NET you won't ask the ques 
Yobit has virtual coins number like big library of books! they use it some times for give people and some times for take from people
But I heared for yobit is scam too many times, but i use its campaigns and withdraw daily without problems never, I don't know.