internet - Should I buy a new fax, or not?

The other day I heard an strange noice in a corner of my office. It seldom happens these days, but somebody was actually trying to send me a fax! So much previous century. It was from a governmental department, so that might explain the old-fashioned way of communicating.
Almost ten years ago I bought this fax with a friend, after having spent a fortune first on fax-services in hotels, since we could not have our own phone at the university. Along with the fax came an official looking document.
The sales person saw my suspicious look and said it did not cost anything. It was a fax licence and I should show it in case the fax police would come and inspect my fax. They never came. The system was introduced in 1989, when the students used the fax machines as a way to communicate.
Now, the old thing has become almost obsolete and the noises in the corner of my office indicated that a major decision should be taken. Am I going to buy a new fax machine or not? I guess not. Maybe I should sell my fax licence on ebay?