There is always the risk of the GCs get hacked. For the HTs who regularly MS like $100k/month, you can't do what Happy recommended above. It is impractical to register more than 200+ GCs each month.
The only thing we can do is to cash the GCs within a very short time windows. Again, it is impractical to cash in the 200+/month with all the new restrictions of the MOs, prepaid loading etc.
As said in all the wiki and newbie guides, MSing is a risky business. You take your own risk and manage it..... Good luck to get your $$$ back.