This MPOE-PR has gone too far. Claiming that their options exchange is the largest bitcoin business, false accusations to ICBIT to proof that MPOEX is the biggest exchange and ICBIT is scam, now attacking everyone else.
If you and your users are completely content with fact that neither you nor them can in retrospect satisfiably verify whether some order actually took place or not, then I understand requiring such high standard makes you nervous and you feel attacked. Correctly using GPG can alleviate such problems in many situations and thus makes scammers incomfortable. Please don't take that personally, I don't mean to insinuate you at all, I don't use icbit either. Just my 2c.