Don't they (ids) just go like 50001, 50001 etc? What's the reason to hide them? It's not like every ID has unique combination of characters.
They are, however they still can be used to identify the account owner (as they the same as the referral ID), and Bter has specifically asked us to keep them private.
I see. I forgot that there are only few hundreds investors among tens of hundred thousand Bter users, so in order to collect all data one have to check all IDe from 1 till the last registered user which is probably 100K or 200K, which is not as easy as just to copy/paste data if ID's are open to public.