Vegas World's Sports Book now limits the total Coins that can be wagered on each event. The max bet per event is 3% of your current Coin total up to a maximum of 10,000,000,000 Coins. Once the Coin maximum has been placed on a game or event, no further wagers on that same game or event will be accepted. Multiple wagers on each game/event are possible, up to the maximum.
The wager is adjusted in the upper right corner next to Bet Size. If the wagers aren't quite the amount you're looking for, there is an option to add a custom amount.