Should I be closing shops?

Expanding on a point made during this thread and a post by someone in the official Maple Story forums, it makes sense that this exploit has been around for a while, because, as someone else pointed out, A nebulites have been dropping in price rather drastically over the past few months. I was ascribing this drop in price to better chances of getting nebulites in Gachapon and the sale in fusion tickets and some other factors, but I now tend to think that people have been duping A nebulites (among other items) and have been selling them on the sly for a few months at the least.