In order to actually earn the tip, the project mantainer (sferik) has to merge your commit. If you provide a value-less commit, they'll just ignore it, and you

In order to actually earn the tip, the project mantainer (sferik) has to merge your commit. If you provide a value-less commit, they'll just ignore it, and you'll get no money. If you provide a bunch of value-less commits, they'll probably get annoyed. If you provide a commit worth merging in to the project, they'll likely commit it, and you'll receive the tip.