What are the advantages for companies to moving from paper to e-billing?

Paper production is an enormous consumer of water, massive producer of greenhouse gases and it contributes significantly to loss of biodiversity. So why not use ebills? Apart from the positive environmental impacts, there is also the cost savings (it is far cheaper to email a bill than to send it in the post because of stamp cost for example). Furthermore, if your bills are delivered electronically, you can include very tailored marketing campaigns for either your own company or partner companies. If you use HTML, you could receive very detailed metrics on your campaign in realtime and even modify it in response to feedback, if necessary. You could, in effect turn the billing process into a line-of-business or revenue generator in its own right. I think companies should really take these positive impacts to mind, it's for their benefit as well as the environments.