Low prices can be extremely enticing - BE CAREFUL!  If you are new to eBay, or even the least bit careless, make sure you look FIRST at the shipping and handling as this is an easy way to get stuck!  You may find, oh, let's say a high dollar item (because I do wedding gowns, I will use that as my example), normally several hundred dollars, yet the "buy it now" cost is $15.99; this may appear to be a "good deal" but if you will check FIRST on the shipping & handling, you may find you are paying $255.00 for shipping and another $60. plus handling then your bid amount. Where's the deal in that? and are you certain the item will be as shown if the seller claims "made to order?" Check with a professional before you buy certain items that may be a once in a lifetime item! 

In my store I have a number of high dollar items and there is little room to increase even "true" shipping and handling costs.  I have a difficulty when it comes to "shipping and handling costs" as these are services and not taxable, but this is an easy way to make extra money it you want to be less than honorable.   The costs of, say "wedding gowns," for shipping and handling is high, because these gowns are extremely heavy - 50+ lbs, but at least be real regarding shipping and handling and use the calculated costs, however expensive it may be!  That's honest business and not thievery!