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@Gomly1980 said, you can't just read this graph in regard of the game(s) made by the creator.
Take Fenoxo by example, there's a full site and forum in addition to the game. So people don't only pledge for the games, they also pledge for the forum. In the same time, having a forum mean that they also have a large community behind them, and have build direct bond with them. It help having more pledge and/or more higher pledge.
In fact, in the top 50, only Akabur probably shouldn't be here. But in the same time he's on the scene since so long. And it's also a factor to take in count. Look Icstor, personally I don't love his previous production ; he's one of the main reason why people now hate RPG maker games. Still he's on the scene since a long time and have already finished a lot of games. For those who love his work, these said finished games are a guaranty. So, they care less that he's mostly milking his patrons, because they know that they'll see the end of the game one day.
This said, there's other people who should be in the top 50. They'll perhaps achieve it on day, but they are too young on the scene, have never finished a game before and, the most important fact, they started to late.
Look at the amount of game actually on the market. 1801 Creators of adult games on Patreon, probably more than 1000 games in progress available here. Let's say that today I release the first version of the most amazing game ever seen, what do you think will happen ? I can answer you, nothing will happen. The game will stay one among a thousand, some people will love it and start to pledge, but it will take at least half a year before it start becoming a hit, and another half year before I reach the top 50.
This simply because the scene is saturated, and it will not stop in a near future. If you want to be really seen, you now need to promote your game. Else few people will give it a try since the start, some will join around the fifth/sixth release, and the majority will perhaps try it when you'll release the final version. Then, perhaps that your next game will become a hit since the start, but don't expect to have success before this. It can happen, but it's a miracle, not a rule.