as a demonstrative pronoun, this denotes something that is present or near in place or time, or something just mentioned, or that is just about to be mentioned
as an adjective, this has the same demonstrative force as the pronoun, but is followed by a noun; as, this book; this way to town
Glad to be of help Norseman.
To answer your question, in 7 fights he may have had several more and other bonuses that you didn't receive, because he fought different opponents than you. And 7 fights is enough to make such a big difference.
Does a comprehensive list of all DM bonuses exist on the forums? I'm unsure of them myself or I'd write it up, and the official page isn't finished as the thing is still in beta: http://www.urban-rivals.com/game/rules.php?show=deathmatch