Could you help with some facts and logical aruguments that would convince an auction site to prohibit the use of sniping software.

Sniping software is used in online auctions such as eBay. 
For a timed auction, sniping hardware allows a bidder to outbid another bidder at the
last possible moment before the auction is closed.  The software can be installed on
your own computer or used by a web site to which you as a bidder might subscribe.  The
sniping websites are generally more successful than individual computers because they
use more reliable servers and programs that have superior (decreased) reaction
times.

Currently eBay allows sniping.  Here are some
comments/arguments against sites such as eBay allowing this
practice.

Unfair to regular bidders:  A person is no match
for a computer in split-second timing.  Even if the bidder were sitting at his computer
at the moment the timed auction ended, his reaction time would be no match for the
computer.

Unfair when the minimum bid increment is small: 
On eBay the bidder can set a secret maximum bid, and the eBay computer will bid for him
as a surrogate bidder, increasing the bid by the minimum increment up to and including
the maximum bid set by the bidder.  This supposedly negates the unfairness of bidding
against someone with sniping software.  However, there is a problem if the minimum bid
increment is small …say ten cents.  This is because if is hard to imagine a bidder who
would not be willing to pay ten cents more than his maximum bid to win the bid.  The
small increment makes it impossible to choose an effective maximum bid.  So when the
minimum bid increment is small, even on eBay, sniping is
unfair.

Advantage to experienced bidders over those new to
the site:  Experienced bidders, especially those with sniping hardware have an advantage
over newcomers.

Sniping adds an element to the bidding
process of which many, if not a majority of bidders are unaware. One could say that the
auction site that permits sniping is engaging in false
advertising.

Sniping negates the concept of a true auction
by humans interacting with one another.  Instead, sniping allows computers to make bids
with split-second timing, beating out humans who lack such light-speed
reflexes.