I think it's important to point out: There is large variation between different locations of Donki. As the article states, floor staff have a large say in what

I think it's important to point out: There is large variation between different locations of Donki. As the article states, floor staff have a large say in what is sold at each location. If you go to a location in a crowded tourist spot, then most of the customers are going to be tourists, and the selection of items will reflect that (more throw-away crap). At the Dotombori location in Osaka, for example, it felt like almost every customer there was speaking Chinese, and the staff also spoke Chinese. Out in more rural areas, in my experience, people primarily shop there for discounted household items. The more bizarre items (and sex toys) seem limited to the urban locations. There is a degree of dichotomy between the two that is worth keeping in mind.