you did'nt get the the $50 because you dont have a US app catolog , it sounds like your got a CR catolog ,which you must have changed by using impostah or while using imposah with a sim card in the phone at the same time
ii understand that once you activate a phone you cant change the country in the app catolog but with a TP you can.
you try this
delate your TP from your profile page (from the palm profile page on the net), then start again with a new palm profile on the TP and make sure you pick all US, then check the new palm profile on the profile page to make sure its says country of origin is the USA, open up the app catolog to check you see paid apps, then back up your pre 2 (including the usB drive)full ease the pre 2 then sign on to the new profile on the pre 2(pick US as the county).
this should give you paid apps &US catolog( i did this that why i know it works ) but you will not have any apps that you have paid for already on ur old profile or the $50 worth of apps