You can use the Bid Increment feature to only accept bids that meet a set target.
To get started set your global Bid Increment (plugin general settings) with any figure, such as 10. This means that all your bidders have to bid at least 10 above the current bid. So if the current bid is $32 the next bid has to be at least $42 and no less. The bidder can place a higher bid if they like, but it must be a minimum value of (Current Bid + Bid Increment).
You can also override the global Bid Increment value and set it per auction. This is useful when you have auctions for selling items of different value.
Posted in: General