In the "Do Not Show" search filter options, add Gachas as one of the checkbox options. Since there are those that have complained about it flooding the marketplace. This way you can help to satisfy both sides of the aisle of those that are for or against it being in the MP.

Plus there is the fact that even when selecting not to show Limited Quantities items, I've seen it still show Gachas despite the fact that Gachas by nature are Limited in quantity by being a non-copy item. Least in this way, people don't have to sift through Gachas that they didn't want when searching for the item they originally were looking for.