Your comment suggest you do not know how bidding works on eBay.
For more information, please take a look at : http://pages.ebay.ca/help/buy/bidding-overview.html
"appear to be instantly raising bids"
Basically you are bidding against other bidders, NOT the seller.
If someone has entered a $10 bid when the seller has placed a minimum bid of $5.00 (for example) the amount shown will be $5.00 until another bidder comes along.
If you place a $7.00 bid on the item, the minimum bid will be automatically increased to $7.50 since someone has already bid more than you ($10.00 unseen at this point)
Take a look at how increments work: http://pages.ebay.ca/help/buy/bid-increments.html
To continue the example, if you bid $8.00 the minimum bid will automatically increase to $8.50
Continuing on the same listing, if you bid $10.00 the minimum bid will increase to $10.50. Since your $10.00 bid is tied with the original bidder, that other bidder would win the listing if no other bid is received (in case of tie, the first bid always wins).
