According to Wikipedia (and why would the internet lie to a person?)
"The ampersand can be traced back to the 1st century A.D. and the Old Roman cursive, in which the letters E and T occasionally were written together to form a ligature. During the following development of the Latin script that led up to the Carolingian minuscule (9th century) the use of ligatures in general diminished. The et-ligature, however, continued to be used and gradually became more stylized and less revealing of its origin..."
...yeah, this is kind of where I stopped reading. Sorry, but I was tired. Essentially what it says is that the ampersand was created because of the inability to take the time to write out the E and the T as their own letters, so they were smooshed together and no one ever thought to change it back. So, laziness, in its own way, created an exceptionally beautiful graphic that I am madly in love with.
I also chose it as my logo mark because in the real estate industry there's always one more thing we can do to rock someone's entire world...so we start with branding. AND then we build a website featuring the home, with interior and exterior highlights...AND then we create a marketing campaign through emails, blogs and event....& it goes on. So many wonderfully creative ways to get heard in a media heavy world. AND we've only just begun.