Thanks for the post. When ever possible we import and show shipping costs for imported eBay listings and pending snipes. For example, if listing has a free shipping option, we note "Free" for listings on the "My Watches" tab. The main issue is with calculated shipping, as it's dependent on a number of factors. We will generally show "Check Listing" for calculated shipping options, as it's not known what they shipping service and/or will be until until the auction closes.
Where we can, we provide information on shipping costs. The idea of a max price is a good one, and we've thought of it before, it poses some challenges but we will continue to try and incorporate new solutions into Auction Sniper, like our new mobile app, to make bidding and winning on eBay even easier.