I didn't think the contests were that popular?
Really? The Contests lasted in the anime for 8 years. Why do you think they were in the show for nearly a decade?
The Contests were the most popular part of the series when they first debuted in the show. Mainly because they attracted female fans to the series due to the shoujo plots and giving the female a story arc for the first time.
How the hell could anyone say an arc such as the Contests weren't popular? That is baffling. They were in the anime for the majority of its run.
Also I don't have exact figures, but Misty was in the anime longer than May was. You say they dropped Misty because of how unpopular she was, but they dropped May a lot quicker.
What does this have to do with anything? Misty's "extra episodes" are throwaway Johto fillers in which Misty does nothing in. Misty wasn't kept for Johto for any special reason, she was just there because there was nobody to replace her with at the time.
Misty was ignored and neglected throughout her entire run, especially in Johto. May got roughly 1 in every 4 episodes of AG about her, had a story arc that got almost the same screentime as Ash's Gyms, and had a Movie to go out on.
There are people who think Misty got better screentime than May? How is being in more episodes, "better screentime?" when she does nothing in those episodes?