I don't believe it's a scam either... If it is I'll find out soon. :)
I did end up accepting their last counter to me last week for the property I was watching and we have an executed contract, planning to close mid-October.
It's just a horrible system for selling a property. It is an auction similar to ebay with a reserve, but there is just no sense in their strategy. If you go weeks with no bidders then get one finally that doesn't accept your counter. Why would you start the next auction at that price, obviously no one was interested at that price point for weeks!
I think it's just very robotic and scripted, I don't think there's anyone behind the scenes that even realizes you're the same bidder. Once you win they hand it to a processor in India that will also be very robotic scripted, like your standard customer service line these days.
The silver lining is that their one-sided contract and policies generally scare off the normal consumer and most realtors don't want to deal with them, so they eventually have to make the price appealing to investors. :)