Hi, if you look at the Bot Tracker site, you will see highlighted in green at the top those bidbots that are still profitable and with under 10 minutes left in that bid cycle.

Now, imagine 10 people are looking at this, then 4 of them decide to make a transfer; within those seconds of processing, each of those 4 users bids a reasonable amount, but added together they can tip that bot into negative ROI. This style of auction almost guarantees this kind of behaviour, and being -10% down is part of the game!