Awesome idea - thanks! You rock.
Now I just need to hide various shipping related fields, both at checkout and at the thank you page so as not to confuse the user. I don't want them having to complete or see anything to do with shipping as it'll just confuse them I think (and my client....).
Unless there's another way?
At the moment I have the products set as downloadable, with the admin charge added as a flat rate handling fee so that it shows in the table on the checkout page.
I've set it to only ship to billing address to do away with the shipping address fields at checkout, all that remains is to sort out the thank you page (basically remove it all!) and update the "Billing & Shipping" title on checkout. I think.
My head hurts :D