For new users that are selling or buying.
Please make sure their adresses are verified.
Only do business to ppl with unverified addresses if you know them or dealt with them before.
But to be on the save side pelase make sure all addresses are verfified.
Which can greatly help, if there are issues and soemthing happened. You will be able to get ur full refund back and officials can pay the scammer a visit at their personal location or atleast have a verified address to work with as a lead.
I am cooking some additional security features to address your concerns...
Stand by as they will be ready very soon

1. I am working on the ISP email verification which works almost as good as the address verification. Basically, you enter your ISP email that has to correspond to your IP in order to get verified.
In case of the trouble, ISPs are very cooperative in sharing a
full info about the offender.
So this is a good balance between respecting someone's privacy AND having a potential to get the relevant info in case of trouble...
They have such a "ISP email verification" setup on ocforums.com and it does a very good job in keeping the trolls away.
2. Soon, when you create a listing in the "sell wizard", you will have an option to restrict your buyers to only those with the heat id, ebay id, or isp email verified status listed in the profile.
3. Likewise, if you are a buyer who searches for a card, you will have an option to filter out sellers without the heat id, ebay id, or isp email verified status listed in the profile.
Again, these will be optional "condom" type of security features. Very easy to follow yet effective.