Be assured that if you can not be online at the auction end and you are afraid that you will miss out on an item that there is a possible solution.
Even if you have already placed a bid but are afraid your maximum bid amount will be not be enough to win the item, you can go in an resubmit a new maximum by merely placing another bid with a higher maximum amount.
For example: Currently the item's bid is at $10.00 and you are the high bidder.
Your maximum bid amount that you had previously submitted was $20.00
Go back in and submit a bid for an amount higher than $20.00. Let's say you submit $30.00
Have no fear your current bid of $10.00 will not be bumped up to the next bid but will stay
at $10.00 until someone bids against you. The software will bid for you until your new
maximum bid of $30.00 is exceeded by someone else.