Because of the partly paid nature of these shares, they should let them trade negative. Or deferred delivery on the fully paid. Or something.
Because the ultimate "$3" shares are probably worth $1.20, which is actually -80c now while they are partly paid.
The current value of 0.01c or 0.02c or 0.05c or whatever it is is completely artificial. And therefore encourages market manipulation and dodgy behaviour. They should be allowed to trade at their true value ( in my opinion, -80c, but that would be for a market to determine ), or suspended from trading.
BCS Price at posting:
0.0¢ Sentiment: Hold Disclosure: Held