I hope the person who conducted this study didn't get paid. A self-report study with extremely poorly worded questions (the direct comparison of ornamental to functional benefits for one) as well as demonstrably poor in game knowledge of each of the game, especially WoT.

For a "science" this field is extremely lax in determining what is allowed to be published and what is not. I'm not a social scientist and I could have done a better job.

The conclusion that there is some small envy of players who have disposable income is the only one this survey managed to establish. A better thought out and thorough study could have given insight into how different types of purchases affect player relations and to what degree. This was done with an afternoon conducting polls of gaming forums.