Just edit the Sellprice and the buyprice in _RefObjCommon in Shard ..
it is by default= Buy Price : 383 , Sell price : 192
for example you need raise the main profit to 30x .... it will be 383*30 = 11490 , and 191*30 = 5730 ..
So Thief selling price of item = 11490 , and trader Sellback to same Npc without trading = 5760
you can use thie query for example
PHP Code:
USE [SRO_VT_SHARD_ROYALTY]
GO
UPDATE dbo._RefObjCommon
SET Price = 3830
WHERE Price = 383
UPDATE dbo._RefObjCommon
SET SellPrice = 1910
WHERE SellPrice = 191
UPDATE dbo._RefPricePolicyOfItem
SET Cost = 114900
WHERE Cost = 16024