If it were in Hong Kong, the bigger the fish, the bigger the price tag... I've even heard of people paying astronomical prices just to be able to host dinner parties based on what is considered the largest fish caught locally, i.e gorupa weighing in at close to if not over 100kg
There is no way you could keep it in a 10g tank for life it is huge.Based on the info i got from the net it grows to 60cm - 65 cm and another site state that it grows to 90 cm.