Despite popular belief, like those expressed by Chalenge, only in regard to long-range strategic bombing did aircraft technology strive to go ever higher. In all other fields of combat the altitudes were far less, usually below 15k feet, because they flew in support of ground or naval operations. They could bomb a city from 30k, however attacking ground forces or ships required far greater accuracy. We see this clearly in the summer of 1944 as the Western Front stopped being only a strategic bombing campaign: With the Normandie landings the primary task of the Allied air forces changed, with the RAF and USAAF being tasked to support ground forces, interdict enemy forces and conduct airfield denial operations. Quite suddenly Allied fighter pilots went from having to fight at nose bleed altitudes to having to dodge church spires.
From the summer of 1944 onwards the air war in the west changed to the same type of air war that had been fought everywhere else since the start of the war. Our "war" in the "arenas" mimics this type of air war very well (for a game). While there are a few players who fly high, long-range, strategic bombing raids, most of our "war" is airfield denial (capping/vulching), supporting ground operations (capturing/defending) and supporting naval forces (carrier ops).