Im very curious about this.

How many Gigs of Bandwidth does the average user use?

Im searching around reseller packages, and trying to figure out if im getting enough bandwidth.

For example i can host 128 sites on this particular plan, and i have 100Gigs of BandWidth.

I mean if every site used all the bandwidth i supplied them, then i assume every host would have a big problem.

I know its probably hard to give me any sort of accurate figure.
But what should i be expecting?

is 100Gig for 128 sites good?
should i be comfortable with this and not even worry

how big is a string? :) but a personal site doesnt use more then a gig.. i think..

It is all depending on what sector of the market you are targeting. For smaller package (less than 3GB Plan), you would expect them to use between 300MB-800MB.
Some of my clients use as little as 15MB/ month.

But for larger package(15GB+), you would expect them to use between 50-75% of the bandwidth they signed up for.