Honest people buy on used gear on ebay because

1) 45 day protection

2) coupons, ebucks, other  discounts. --- I purchased  items with 10% off  a 20 coupon then 2% off .  the item was cheaper then any seller anywhere.

3)they do not have the btc to buy gear

4) I sell on ebay my gimmick is my gear is the cheapest on ebay in its class.
    I do well. I give them complete setup help and never sell anything I can't run in my house.
    Many buyers actually trust me since I do the right thing for them.