I think that hard work would always get pay off, sooner or later, but it would certanly.
In this case, Matija had a nice concept how to accomplish this mission, and he was making it for seasons...
Dont forget that its not easy to "tank" in Serbia as there are couple of great managers, like Polish manager said, capable to play in, at least, semi finals of B3.So, in that competition, be dominant and get used on playing finals of PO and trophies from cup aint easy task...which makes his success even bigger.
At the other hand, i would say its good to have such a competition, as you can always learn something new from other managers.
I believe that Serbia have done great job in last seasons and Matijas success is just one more proof it.