Mine

make a new table in l2jdb called BonusIP
make 1 row called ipnumber that is a string

in server.properties
===============================
RateQuestsReward = 1.
RateDropEquipment = 1
+BonusRate = 1.5




in L2PcInstance.java add this
===============================
+private boolean _bonusrate = false;
+    
+public final boolean getCharBonus()
+{
+     boolean result = false;
+     java.sql.Connection con = null;
+     try
+     {
+	     con = L2DatabaseFactory.getInstance().getConnection();
+             PreparedStatement statement = con.prepareStatement("SELECT COUNT(*) FROM accounts WHERE lastIP IN (SELECT ipnumber FROM BonusIP) AND login =?");
+             statement.setString(1, _accountName);
+             ResultSet rset = statement.executeQuery();
+             result = rset.next();
+             if (rset.getInt(1) > 0)
+             result = true;
+             rset.close();
+             statement.close();
+      }
+      catch (SQLException e)
+      {
+              _log.warning("could not check existing charname:"+e.getMessage());
+      }
+      finally
+      {
+              try { con.close(); } catch (Exception e) {}
+      }
+      return result;
+}


private L2PcInstance(int objectId, L2PcTemplate template, String accountName)
{
	super(objectId, template);
        _accountName  = accountName;
        _level        = 1;
        _blockList    = new ArrayList<L2PcInstance>();
        _nameColor    = 0xFFFFFF;
        baseLoad      = template.baseLoad;

+        // team Olympus custom addition.  Customer bonus, by ip.
+        _bonusrate = getCharBonus();
}



private L2PcInstance(int objectId, L2PcTemplate template)
{
        this(objectId, template, null);

	// Create an AI
	_ai = new L2PlayerAI(new L2PcInstance.AIAccessor());

	// Create a L2Radar object
	radar = new L2Radar(this);

	// Retrieve from the database all skills of this L2PcInstance and add them to _skills
        restoreSkills();

	// Retrieve from the database all items of this L2PcInstance and add them to _inventory
        getInventory().restore();

	// Retrieve from the database all macroses of this L2PcInstance and add them to _macroses
        _macroses.restore();

	// Retrieve from the database all shortCuts of this L2PcInstance and add them to _shortCuts
        _shortCuts.restore();
        
+        // Retrieve from the database wether bonus rates should be applied
+        _bonusrate = getCharBonus();
        
	restoreHenna();
}


public void addExpAndSp(int addToExp, int addToSp)
{
+        if (_bonusrate)
+        {
+          addToExp *= Config.BONUSRATE;
+          addToSp *= Config.BONUSRATE;
+        }



in config.java
===============================
    	/** Rate control */
    	public static final float   RATE_XP;
   	public static final float   RATE_SP;
   	public static final float   RATE_QUESTS_REWARD;
    	public static final float   RATE_DROP_ADENA;
    	public static final float   RATE_DROP_ITEMS;
    	public static final float   RATE_DROP_SPOIL;
    	public static final float   RATE_DROP_EQUIPMENT;	
    	public static final float   ALT_GAME_EXPONENT_XP;
    	public static final float   ALT_GAME_EXPONENT_SP;
    
+   	public static final float   BONUSRATE;



	RATE_XP              = Float.parseFloat(serverSettings.getProperty("RateXp", "1."));
	RATE_SP              = Float.parseFloat(serverSettings.getProperty("RateSp", "1."));
	RATE_QUESTS_REWARD   = Float.parseFloat(serverSettings.getProperty("RateQuestsReward", "1."));
	RATE_DROP_ADENA      = Float.parseFloat(serverSettings.getProperty("RateDropAdena", "1."));
	RATE_DROP_ITEMS      = Float.parseFloat(serverSettings.getProperty("RateDropItems", "1."));
	RATE_DROP_SPOIL      = Float.parseFloat(serverSettings.getProperty("RateDropSpoil", "1."));
	RATE_DROP_EQUIPMENT  = Float.parseFloat(serverSettings.getProperty("RateDropEquipment", "1."));            
+	BONUSRATE            = Float.parseFloat(serverSettings.getProperty("BonusRate", "1."));