I use to be a more sweasoned eBayer back in the day so rules may have changed. Way I see it is, if it has a BIN of $20 and a starting price of $15, if someone starts it at $15 or $17, then I thought I remembered that it use to erase the BIN option. However, I think nowadays, someone can bid less than the BIN but, someone can still come along and scoop it up for the BIN price. I think I just confused you further. I know someone here will be able to answer your question head on.