This wouldn't happen with SteemAX because you can always cancel the exchange at any point. Sure, there will always be people trying to game the system. But bidbots are totally blind and take bids from anyone. SteemAX solves this problem because humans will likely only support other humans they deem worthy. Spammers will not like SteemAX because each invite requires a captcha.
Please see my other comments about SteemAX on this post. :)