Chargebacks can happen anywhere the retailer accepts a credit card as payment, not just on ebay by the way.

In fact if you get a chargeback anywhere else other than thru PayPal you are totally on your own to fight it. Good luck with that.

There are other reasons why I would be wary of selling high value items on ebay. Namely the fact that ebay are so heavily biassed towards the buyer you stand a very real chance of total loss of the item.