I had been discussing this in the comments of a reddit post I made a few days ago and during the discussion a redditor shared their big list of MMO gold seller sites that need blocking.
I am passing along this information if you too would like to keep these ads from showing up on your blog.
Here is a link to the comment where they give the list. As you can see it is quite extensive and gives us a little bit of an idea as to how many players are in this.
Again I am firmly against the trade of in-game gold/items/power leveling etc for real-world money. It is against most MMOs terms of service and has an overall negative effect on the games they choose to infect.
We make our gold the good old fashioned way. One copper at a time with out wits, persistence and the help of each other!
Again I encourage my fellow gold bloggers to consider blocking ads from the sites listed in the link above.
Also I got a very good suggestion which was to add a notice letting people know I do not condone MMO gold selling and provide a way for readers to report any of these type of ads that do show up.
If you see and MMO gold seller ads on my blog please let me know at firstname.lastname@example.org.