Wonder where these Chinese sellers come from?     Getting so much feedback so quickly?   

Its really simple,  they just buy it.    

I have attached a picture of a typical advertisment I found on a well known Chinese site,   there is tonnes of these types of adds offering this service. Which enables them to quickly set up stores and list thousands of cheap items that will automatically rank higher,  it does'nt stop there either..  These guys often have several stores on standby waiting for the bad feedbacks to roll in, then simply delist and relist on the new store... 

How it works:  After paying the fee, someone will buy items from the store.  They immediatly leave Posative Feedback,  but do not pay for the item.  It is then up to the store owner to open unpaid item cases for each sale,  using the Automatic unpaid item manager is recomended..   

I'm sure Ebay is aware of this service, but still these types of shops seem to be popping up all the time..