Expensive items by non-genuine sellers

I just bought some expensive items (aroung £3500, eBay BIN,paid with Paypal) from a seller with low feedback. I then see exacly the same listing (same description, photos & price) from another seller also with low feedback. My instinct tells me that these sellers are not genuine and I won’t receive these items. Suppose that I’m correct in this assumption, then my questions are:

1. Is there anyway I’m going to lose my money ? 

2. And why some people sell what they don’t have? What are they going to gain in doing this? 

Thanks for sharing any experience and advice!