Most likely, he sold it to himself to attract this kind of attention. Paint the tape
It's a shame more people don't use BitFloor though. It's the only exchange which offers nearby bank deposits, but it's impossible to buy anything below the GOX high.
the deposit method is/was too inconvenient (i noticed some new option was added, no clue about that). the withdrawal method is inconvenient in some cases, where one doesnt want to withdraw money to bank but would rather move it elsewhere online