Readers, we'd love your input <3

I'm chatting with two fellow series-writing authors about the number of series I write and how I keep up. I love writing series, and I love that mine all cross over, because it's so much fun to catch up with the characters. Since all of my books in every series can be enjoyed as stand-alone novels, there's no worry of readers missing out if they jump in at any point, and I see no reason to stop writing them. So please don't worry, I enjoy writing them too much to stop :) The question we have is this...
--- Some of us publish the next-in-series 3-5 months out. Some publish one or two books/year in their series. And sometimes, like with Harborside, there's a year or more between series books. What are your feelings on series? If you adore the series, do you still pick them up a year later if that's all your fave authors can manage?