Guys i've same problem before.. try other method here:

1) find "Better Terminal Emulator" on market download and install. set root permission "always allowed"
2) Open then type : su
3) type in : setprop gsm.sim.operator.numeric 310260
4) type in : getprop gsm.sim.operator.numeric (to see ist set to 310260 or not.. if 310260 appear then u are done)
5) Go to setting -> application -> manage application -> find market -> clear cache -> force closed -> exit
6) Go to Home -> Menu -> market run it.. then u will see paid app.

Gud luck.. i did this way and its works!!