I understand what you're saying, but in reality the market is and never will be a level playing field. The way I see it is that trades are going through that otherwise would not have, meaning volume and potentially a move up in SP (ie. without all the 5.5 trades it is very likely that the .5's would have been sold down into)
Just my two cents
MPJ Price at posting:
0.6¢ Sentiment: Buy Disclosure: Held