I use mine only once per week, because, exactly as you said, there are so many good soaps available now.
I got some advice on another forum which may be a key to why it performs so well for me. When the puck is new / dry, add distilled water to the ceramic container and leave it sit until the puck absorbs the water and has expanded to fill the container. If you need to add more water / wait longer, do so. After that, use at least once per week and you're golden. I know, YMMV. But I did this and have never had a problem. But, I"ve also had problems and been unimpressed with other soaps and products others rave about.
C
Do believe this is the deal!
I fear mold if it stays wet. But if you keep using it, it is being scraped every day by the brush .... Interesting.
AA