I voted "I feel like I should keep going in case the series gets better again."
I'm basing my answer on books which I have invested more than 5 or 6 titles into.
Once I find a series I really like the books become auto-buys for me (when funds allow).
I normally have a three bad books limit - if it's a really long running series - before I consider leaving it behind. But only for long running series.
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