If you add an escrow this might actually work. But not the way you try to do it now without one. Bitcoiners are quite aware of the risk your offer is posing. Too many scams happend already.
Im not getting the thing with the code but probably thats something thailand related.
I think that would probably work something along the lines of the UK 'quick cash' that some banks offer. Its a service for people who have lost their card really, and lets them request a one-time ATM code which lets them withdraw up to £200-£500 (I forget what) at a time. The OP could be offering to give people those codes to let them withdraw directly from his account, which is in itself quite a good idea as long as its not breaking t&cs of account use.
The OP
could be genuine but I would not advise anyone to try and find out. This service needs two things and then it could be quite successful:
-An escrow or proven track record
-Quicker availability of funds