Websites are very much like how Telephones were for business a long time ago.
Not everyone had them, not eveyone sold things over the phone and there were others that used it and grew their business.
Does every business need to sell and have cart with a SSL. Worry about devlivery of that product or service? NO information is a transaction.
The other examples and reasons above me are all examples of transactions.
If you were to look at my site... Between adwords and a single page that gave me an 8000% return for the month of June. It asks for no CC info only that they call me or fill out the form online and I call them.