Ok, so I've been thinking; Rageball and DTV are terrible as they are right now; you pay upkeep, and your options are limited, but without the fast pace of battle to offset it. They're money sinks, so essentially my suggestion is that these modes should not charge upkeep for items, or given XP. That way people would not farm the servers for levels (like they do now), and you actually are guaranteed to gain money, though in small amounts.
this would...
-Reduce leeching
-Reduce raging
-Encourage players to join
-Reduce restrictions on play style
-Increase the overall "fun factor" due to no leveling and no repairs to consider.
I personally am in duel because its a fun way to improve my skills, and make a little cash at the same time; the xp is nice, but if i had to change that, i would rather get more gold, on a per duel basis; say 50 gold EACH DUEL. Once again, not really exploitable (unless some dumbass desides to get killed for an hour straight, perhaps 4 deaths a minute would equal 12k if someone was really determined), and gives more incentive to actually duel people. once again, i would recommend NO XP in duel as well.