Expectations for GTA: Chinatown Wars DS, 1st Week!!!

[mai]

outlawauron said:
It should do no less than 200k in its first week. The PSP one sold 150k on a userbase that was much, much smaller.

Game A sold 1mln on userbase of 10mln => game B should sell 10mln on userbase of 100mln? Sorry, but that logic seems to be broken. Need to explain?