I've slowed down with adding items to the store. Roll20 remains fair and easy to develop for. As a hobby platform to collect a small amount from it's fine. But... sales no longer cover the monthly phone bill. The decline in customers has been severe for my experience since 2021 and on, unsure about others. I just make art packs for now. As a secondary positive with a guarantee, "Roll20 marketplace creator" might look great for your portfolio and resume if you are taking your hobby into a professional space. In that regard, even if sales are discouraging, populating your storefront can remain rewarding.