Customer oversubscription levels

[Mathew Lodge <mathew () cplane com>]

This might be a dumb question, but I can be sure that I'll be told if 
that's the case, so here goes:

What's a good oversubscription ratio for customer traffic to global 
Internet bandwidth these days? I.e., if you have, say 90megs of bandwidth 
to other transit providers, how much bandwidth, in aggregate, are you 
selling to customers -- 90? 450? 900?

Do customers care about this? Or do they assume that if they get a T1 to 
the Internet from you that they have their own T1's worth of non 
over-subscribed bandwidth to your transit providers?

Thanks,

Mathew