Many newcomers to ebay are also new to chip collecting and buying. You have to look at the whole picture. A few feedbacks are not enough to go on.

Many of us buy from other cc members and people who use the board. I am a seller but buy plenty too and I have my favorite sellers.

Ebay and Paypal are owned by the same people. You can easily report a suspected shill bidder by going to ebay ask a question.
Most items go through paypal and they do check in more ways then one to determine if someone is shill bidding.