I have to disagree with this analysis on a couple different levels.
First, the opening statement that great work is a combination of natural ability + determination. I don't believe this to be the case, and I think this logic only works when you're doing post-hoc analysis for why certain people did well and others did not. There are plenty of people who had both natural ability and determination, yet failed throughout history. Some of them only becoming known long after their death (and whom lived in poverty to that point), others which failed because their choice of interest was considered to be the 'bus ticket collector' at the time.
Which leads me to my second point: We don't actually know if someone being a 'bus ticket collector' is valuable or not until long after their obsessive interest. For example, there are people that archived videos of various new stations. Those videos at the time were considered useless, but now they're more valuable because no one else was really obsessively archiving said video. This sort of thing isn't going to make someone rich or grant them status, but it's something that turned out to be very valuable to society as a whole and something that could be used to make someone rich.
Which ties into the fact that a lot of this is luck. You have to be lucky that what you're obsessed with is truly unique, that it's something that can earn you value now, and that you have the support network or monetary means to seize opportunities when they come across you. Sometimes the greatest discoveries are things that have been found solely by accident. You might be lacking a certain item, and you substitute it with something else which leads to a big breakthrough and so forth. Obsessive interest can help lead us to something great, but sometimes we simply trip upon something greater along the way.