When you sell on eBay it is so frustrating, they take a simple process and make it less functionally that it should be. They could make life easier for sellers but they do not think of the obvious, they think of it from doing a specific function but in that process they forget that it should do exactly they imply.
A fine example if their bulk relist or relist as fixed price or edit.
When you add best offer it shows bulk options but these options only work if you already have best offer minimum values preset…
… Even though you are adding these in bulk and therefore it is obvious that these would not be set.
A simple corrective formula would be something simple like
If value=0 or value=blank then set value=buyitnowprice.
Then it can use the decrease setting. Of course it would lock out the increase setting because it would not be valid and then would give an error of best offer amount is higher than buy it now price etc.
So today I spent the time manually changing these settings because of a lack of functionality that should be in there.