Like john_moscow has pointed out, though, that deters people from becoming Patreon creators. It's very normal for people to underestimate the difficulty of what others do or the real worth of their work. Besides that, supporting someone economically in a capitalist environment is giving them your vote for them to continue doing what they're doing. Not voting for them, when you otherwise would, solely because you can see they have some quantity of votes already, disrupts that.
I would like this type of economy to flourish, as it seems like a very viable way to get good economic support for open-source. However, if this is a common occurrence, it seems developers will continue to be better off working on closed-source.