with THAT you might be onto something!
there might be a (more or less) coincidential connection between people investing in bga and are also decent at the game, in the lower end of the skill scale at least ... and vice versa - in general.
but that SHOULDNT matter much since 7wd is way more a skill game than a luck game, even vanilla, and arena rating works like elo (look up how that works and why it doesnt matter for your avg point gain (with some asterics here...))