No, not in reality.
I have 14 followers at the moment (well when I last checked today)
If those 14 have an average of 5 followers and re tweet (just 1 click) then that gets it shown to to 70 accounts, then those 70 could re tweet etc and follow people they not following.
It's just a way of getting more people to see YDC auctions. I would obviously gain the sellers permission to use their picture and in return I would link direct to their auction/s for the YDC listing.