Hiya Turnip,
You *could* place a small proxy bid on the item if you want to make sure it will finish. Keep in mind that the seller can still cancel the auction if they feel they arent getting a good price. They arent *allowed* to cancel the auction at all, but that doesnt stop them doing it.
Its a tuff choice, some will say that by placing a proxy bid you are showing your interest in the item and run the risk of other bidders being alerted to that fact and therefore starting a bid war....I personally, have placed many a proxy bid as well as a snipe. I have even ended on my proxy bid and walked away seriously happy with the price I have paid.
If you place a proxy and then AS snipes for you as well, you will get charged for that snipe if you win, even if you win on your proxy bid (small price to pay though). The end price wont increase unless you are in between increments (part increment) then ebay will only increase your winning bid by a small portion.
After all that waffle, I would email the seller with some bogus questions to let them know that you are indeed interested and will be bidding. Place a small proxy bid and then let AS do its thang. I gather you have placed your MAX bid in AS and you have made it an odd amount ($50.57 instead of $50)
Good Luck and let us know how it all turns out.
Lexie