Trusted gold selling services
If you want to buy a gold, ingame currency from gold sellers, first of all you should check their requisites especially:
Webmoney certificate (russian gold sellers). It should be at least "Персональный" or "Продавца"
Certificates of webmoney usually located on the footer of websites.
BL Webmoney (Business Level). The bigger BL, the better. If small BL it mean people rarely make payments.
Methods of payment. The more methods of payments at gold seller so much the better.
There is the list of the most trusted gold sellers: