The words "DISPUTE" a bit blur... what about change the background colour, so we can see clearly "DISPUTE".. Same also to "BLACKLIST" tag. Make it a bit bigger also can be nice to warn everyone....

If LYN just do Invite style for new user / newbie like Gmail how?

To me better make 1 pinned thread & list down Hp Dealer/Reload Card Deaer/Hard Disk Dealer/Any Dealer so LYN Forumer Can Check Account Number are belong to who.
The Pinned thread are "Unedit" , so dealer/seller have to PM To "Person In Charge" to make their detail in Pinned Thread. Only ADMIN,TE or ETC Only can Edit The Detail.

Example :

RELOAD SELLER NAME / HP SELLER or DEALER
Contact Numver :
Bank Detail :
Account Number
Email.
Seller Thread : Link to Seller Garage Sale

With this, Forumer can check this account detail in PINNED thread, so maybe can less the "3rd Party Fraud" case. Where to put, Every Garage Sale Subforum under Annoucement.

Just my suggesstion.