thing is, why should he stop? He's obviously got no morals to have done it thus far, it's free money and who's going to stop him? All he has to do is use PCs at different internet cafes/libraries etc and no one will know. The Police may eventually catch up with him but he's already probably got a record so what does he care?
Vigilante rights? I would of course not condone, nor would I expect golfgti.co.uk as a whole, such action*
* (but it may well be the only way to stop the situation)