It just shows that there are many opportunities in the small exchanges.
This could be because Camp BX is one of the few exchanges where Dwolla withdrawals are relatively instantaneous.
There is an alternate explanation as well -- a thief that has a hacked account at an exchange will withdraw the daily limit of bitcoins then sell whatever is left, along the same lines as the thief that robs homes and then vandalizes them as well.
The volumes at the bottom end are so small though, this was probably just some impatient Dwolla user.
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http://bitcoincharts.com/charts/cbxUSD#rg1zig15-minzczsg2012-07-20zeg2012-07-20ztgSzm1g10zm2g25zv
