I do think TcmDeb means a differnt thing tha I dith my point b) above.
If A has a maximum bid, it is fine that the system goes along with his maximum (A not used yet to its full extent) as soon as someone else is starting to bid within that range of A.
But the system has to give the correct proposal for the next need step in amount to be able to overbid A. This is currently not the case
Regarding the other issues I mentioned (bid steps too big and bid steps in .5 not possible), this should IMO made as an option in the admin menu, so every administrator can use for his own need the right setting.
IMO the most usable setting is to alow any kind of higher bids, even if it is only in cents of .01. Only with small steps like this, you do ensure that bidders are not afraid to be forced to pay more tha they actually wanted to. and this is mandatory to attract as mans users as possible for an auction
I will post this last part of bidding steps also in the suggestion area...