I was looking through the input.ini and I saw what appears to be some commands carried over from the 360 version or something. [Engine.UIDataStore_InputAlias] InputAliases=(AliasName="PlaceBet", InputAliases=(AliasName="CancelBet", InputAliases=(AliasName="SelectBet", InputAliases=(AliasName="RemoveBet", InputAliases=(AliasName="RemoveThisBet", A little further down was InputAliases=(AliasName="UnlockFullVersion", Perhaps a reference to a trial version on the 360? I cut out a bunch of code after the commas that referred to XBox 360 controller buttons. I'm no good with UT3 engine so the subsection it's under is no clue to me. Pardon me if this is old. I've not yet heard anything about this. Various google and forum searches brought up nothing.
Most likely leftovers from the unreal engine. Or perhaps it's simply referring to the money cost of certain things.
Betting would be a cool mechanic to add as a "spectator only" sort of thing. Sort of like what Smash Brothers Brawl does but more indepth.