i dont sell the scripting, but have been using it for about 3 years now.
i too looked high and low for full featured auction software, and this one is very good in my book. there are of course alternatives that use php scripting, but if you look around you will see that most of them are cookie cutter sites.
but the cost of the scripting they sell at usanetcreations, and the customer support you get with it, it almost cant be beat.
even if you are on dial-up the scripting is less than a meg download, so it might take 10 minutes on dial up, but then you can just burn it to disk, and you will have a hard copy.
im not trying to sell you on this software, as i am just a member here, but it is good.
if you want to see some of the members sites, i am sure they will add some links as soon as they have time.
good luck in whatever you decide to do.
oh, and richard is the person to talk to if you want to make a purchase. this is his business.
p.s. when you buy the scripting it is yours to do with what you want as far as customisation. so you can make it look exactly how you want it to, without having to ask for permission, or updating licences.