Here is an article on the salaries for the top Euro basketball players. Bodgan made about 1.3 mil in 2015. The top player made 3.4 mil per year:
https://www.talkbasket.net/salaries
You can not honestly tell me that if Vlade gave Bodgan a 4 year, $24-28 million contract, that would give him and his family financial security for the rest of their lives, he wouldn't come to the NBA? It would take him playing for 15 years in Europe, to make what he could make in 4 years in the NBA.
If he passes up now, he would be 26 years old before the start of the 2018 season and he would go from potential star player, to rotation player in the eyes of teams. That could cost him $100 million in the long run.
Personally, I think there is no way he passes the opportunity to play in the NBA this year, with the contracts being passed out and rookie scale no longer holding back his salary. If he comes here and fails, he can always go back to Europe to finish his career.