Quoted from CaptainNeo:
why does everyone think you even have to buy NIB? There are 1000's of other games out of the box, that are just as fun if not MORE fun than these NIB games coming out. What's better, is that you can buy 2-3 or even 10-20 of the other games for the same price as 1 of these NIB. The last 10 games I bought before GB premium cost less than the GB. Buying a NIB here or there is fine, but it's not the end all or even a must have.
For some people buying NIB is just practical. If you do not have much technical knowledge NIB is very good. The things I have seen with not NIB machines to fix a problem With NIB you know exactly what has been done to a machine and normally they don't break as quickly.
With all the new people getting in to the hobby, technical knowledge is severely lacking and who can blame them ? Everybody has to learn somehow. If you just want to play and not fiddle around every few days, NIB is a good choice.