Now that I think of it the default case is the null case.

src/com/massivecraft/mcore/money/Money.java

@@ -8,7 +8,7 @@ public class Money
 	// MIXIN
 	// -------------------------------------------- //
 	
-	private static MoneyMixin mixin = MoneyMixinDefault.get();
+	private static MoneyMixin mixin = null;
 	public static MoneyMixin mixin() { return mixin; };
 	public static void mixin(MoneyMixin newMixin) { mixin = newMixin; }
 	
@@ -36,6 +36,7 @@ public class Money
 	
 	public static boolean enabled(Object universe)
 	{
+		if (mixin == null) return false;
 		return mixin.enabled(universe(universe));
 	}
 	
@@ -50,16 +51,19 @@ public class Money
 	
 	public static String format(Object universe, double amount)
 	{
+		if (disabled(universe)) return String.valueOf(amount);
 		return mixin.format(universe(universe), amount);
 	}
 	
 	public static String singular(Object universe)
 	{
+		if (disabled(universe)) return "singular";
 		return mixin.singular(universe(universe));
 	}
 	
 	public static String plural(Object universe)
 	{
+		if (disabled(universe)) return "plural";
 		return mixin.plural(universe(universe));
 	}
 	
@@ -69,11 +73,13 @@ public class Money
 	
 	public static boolean exists(Object universe, Object accountId)
 	{
+		if (disabled(universe)) return false;
 		return mixin.exists(universe(universe), accountId(accountId));
 	}
 	
 	public static boolean create(Object universe, Object accountId)
 	{
+		if (disabled(universe)) return false;
 		return mixin.create(universe(universe), accountId(accountId));
 	}
 	
@@ -83,11 +89,13 @@ public class Money
 	
 	public static double get(Object universe, Object accountId)
 	{
+		if (disabled(universe)) return 0D;
 		return mixin.get(universe(universe), accountId(accountId));
 	}
 	
 	public static boolean set(Object universe, Object accountId, double amount)
 	{
+		if (disabled(universe)) return false;
 		return mixin.set(universe(universe), accountId(accountId), amount);
 	}
 	
@@ -97,11 +105,13 @@ public class Money
 	
 	public static boolean add(Object universe, Object accountId, double amount)
 	{
+		if (disabled(universe)) return false;
 		return mixin.add(universe(universe), accountId(accountId), amount);
 	}
 	
 	public static boolean subtract(Object universe, Object accountId, double amount)
 	{
+		if (disabled(universe)) return false;
 		return mixin.subtract(universe(universe), accountId(accountId), amount);
 	}
 	

src/com/massivecraft/mcore/money/MoneyMixinDefault.java

@@ -1,92 +0,0 @@
-package com.massivecraft.mcore.money;
-
-public class MoneyMixinDefault extends MoneyMixinAbstract
-{
-	// -------------------------------------------- //
-	// INSTANCE & CONSTRUCT
-	// -------------------------------------------- //
-	
-	private static final MoneyMixinDefault i = new MoneyMixinDefault();
-	public static MoneyMixinDefault get() { return i; }
-	
-	// -------------------------------------------- //
-	// ENABLED AND DISABLED
-	// -------------------------------------------- //
-	
-	@Override
-	public boolean enabled(String universe)
-	{
-		return false;
-	}
-	
-	// -------------------------------------------- //
-	// FORMAT AND NAME
-	// -------------------------------------------- //
-	
-	@Override
-	public String format(String universe, double amount)
-	{
-		return String.valueOf(amount);
-	}
-	
-	@Override
-	public String singular(String universe)
-	{
-		return "singular";
-	}
-	
-	@Override
-	public String plural(String universe)
-	{
-		return "plural";
-	}
-	
-	// -------------------------------------------- //
-	// EXISTS AND CREATE
-	// -------------------------------------------- //
-	
-	@Override
-	public boolean exists(String universe, String accountId)
-	{
-		return false;
-	}
-	
-	@Override
-	public boolean create(String universe, String accountId)
-	{
-		return false;
-	}
-	
-	// -------------------------------------------- //
-	// GET AND SET
-	// -------------------------------------------- //
-	
-	@Override
-	public double get(String universe, String accountId)
-	{
-		return 0D;
-	}
-	
-	@Override
-	public boolean set(String universe, String accountId, double amount)
-	{
-		return false;
-	}
-	
-	// -------------------------------------------- //
-	// MODIFY
-	// -------------------------------------------- //
-	
-	@Override
-	public boolean add(String universe, String accountId, double amount)
-	{
-		return false;
-	}
-	
-	@Override
-	public boolean subtract(String universe, String accountId, double amount)
-	{
-		return false;
-	}
-	
-}

src/com/massivecraft/mcore/money/MoneyMixinVault.java

@@ -29,7 +29,7 @@ public class MoneyMixinVault extends MoneyMixinAbstract
 	
 	public void deactivate()
 	{
-		Money.mixin(MoneyMixinDefault.get());
+		Money.mixin(null);
 	}
 	
 	// -------------------------------------------- //