Ron. W.: Perhaps he thought in the future he would be able to retire and live a non jw life of ease on the strength of these and other donations..
That would have been a possibility if he knew what he was doing. As others are pointing out, he doesn't plan. He doesn't understand the effects of his actions or the ramifications of his decisions. He was making more than the average person in Croatia, possibly by a very healthy margin. And his expenses should have been small since his in-laws were providing him with living space. Even accounting for his extracurricular activities, he should have been living well below his means and building up a sizable nest egg.