The Guild Wars official site has an a short news bit on their exploitation policy.
|s players may have noted, we took action to close a game exploit today. We would like to remind players that the willful use of exploits is against the EULA and the Rules of Conduct. Several players who used the exploit have had their Guild Wars accounts permanently banned. If you find an exploit, please contact us directly through firstname.lastname@example.org. We are grateful for the assistance of the community in such matters, and will attend to reports as promptly as possible.|