Go to your Emulator file. Put it this way:
db/pre-re/item_cash_db.txt or db/re/item_cash_db.txt
// Cash Shop Database
// Contains the items sold in the ingame cash shop.
//
// Structure of Database:
// Type,ItemID,Price
//
// Type:
// 0: New
// 1: Hot
// 2: Limited
// 3: Rental
// 4: Gear
// 5: Buff
// 6: Heal
// 7: Other
// 8: Sale
//
// Price:
// Item cost, in cash points (#CASHPOINTS).
0,2629,2000
1,2629,2000
2,2629,2000
3,2629,2000
4,2629,2000
5,2629,2000
6,2629,2000
7,2629,2000
8,2629,2000
Turns the emulator off and on.
This is just a test.
If it still does not work, you're doing it, or you've done it wrong.