Really the number is going to greatly depend on your types of users. I think a better question would be:
"How much does my diskspace cost me as a host?"
Using that question you can price your packages properly and offer several packages in different sizes for user's to choose from.
I.e. Let's assume you're running 250GB disks on your machine and the OS/Control Panel/Etc.. takes up 10GB of space. You also want to keep local backups on that machine as well as remote backups on another machine.
So we take the 250GB and we whack off 10GB for the OS. We're now down to 240GB of usable space.
Assuming everything is maxed and you want local backups when then have 120GB of space left to be used (the other 120GB of space will go for the backups).
Assuming you are paying $100/mo for that machine then it is costing you $100/mo for that 120GB of space.
120GB / $100 = $1.2 per GB of space. I will leave factoring in the remote backup costs out of this as I'm trying to keep it short and simple.
Using that simple formula you can see that you're cost is roughly $1.2/GB of space (without overselling) and that should help you in pricing your plans out.
Average is probably in the 500MB range but it can vary quite a bit and in some cases you'd be surprised where the space is coming from.
You'll see some users who decide they want to turn catch-all on for whatever strange reason. Over the course of 6 months they end up with 1GB of emails due to the fact they did not check their catch all and did not turn on any spam filters.
Most instances though it's go into fantastico let it install wordpress then maybe 10MB used by MySQL with another 60MB used for images and other files. If there weren't strange instances the average wouldn't be near 500MB.
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Yep I agree with Tony, alot of the time its catch all or unread of archived emails that starts taking up all the space, which can be a big pain in the butt
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