What do you think of websites using this amount of bandwidth in a day. We have a few customers which use 25-30GB of bandwidth transfer per day. Over the top a little for virtual shared accounts?

It depends. Is it causing problems that effect your other clients? Since none of your plans allow for that much transfer, are you charging these customers overage fees to cover your bandwidth costs?

Perhaps you should think about moving these customers to their own VPS or Dedicated server and let them pay for their own bandwidth.

[edit] misread your post [/edit]

he's talking of 30 Gb a day, that is 900 a month...this kind of bandwidth is usually associated with high end VPS or low-mid end dedicated servers

btw I think I haven't understand the sense of the post duport, can't you suspend them until the end of the month or overbill them for extra consumption?

It does not affect the system as it is on a machine for these larger sites only. I know Servage and others have daily limits was just wondering good or bad adding such daily limits, e.g: 30GB daily.

that's LOTS of bandwidth how can you afford it!?

duport are you talking about a shared hosting customer or a vps customer?

It depends upon you, your cost and the price you charge. Now if the client is paying you the excess charges and I think he is paying since his alloted limit is utlized within 2 days if his data transfer is 30 GB/day, and as you mention that you are not having problem with server resources, than why the limit. You will be making some profit on the excess data transfer charges.