Thanks for playing! Table self blocking is intentional, it's moreso for the freedom to do it than for any benefit. Buyers coming in without any items for sale is something I know about and need to fix. They should 'drop' the item and it goes to your storage, I'll see if that's a bug. Speaking of that isn't a half bad idea, they physically drop the item and you have to pick it up... might be a good mechanic, I'll experiment later. Cheers.