Because all bidders have the ability to place a MaxBid, you may find from time to time that you have been outbid by an amount that does not seem correct.
For example, if your MaxBid was $100, yet you lost an item to another buyer who won for $101, here's why:
At 12:01PM, Lot 1 is at $40.
At 12:30PM, Bidder1 (yourself) places a MaxBid for $100.
Bidding continues and at 12:45PM, lot 1 is at $85.
At 12:46PM, Bidder2 places a MaxBid of $101.
Bidder2's bid is accepted since it is above the $5 minimum increment at the time (since the lot was at $85), and it also outbids your bid of $100.
As another example, if you place a MaxBid of $10 when lot 2 is at $2, why did your bid jump to $6?
Another bidder had a $5 MaxBid, so when you put in the $10 MaxBid, it jumped to the next $1 increment from the $5 MaxBid to $6.
Note: Increments are only used to calculate the minimum bid amount. If you submit a MaxBid on an item that already has a MaxBid by another user, then the user with the highest Max Bid wins.