I've been cooking/grilling/barbecueing/whatevering with charcoal for about 20 years, ever since I was in high school.
When I went to college, I really got into grilling - it was how me and my 4 other roommates at most of our meals... we'd roll out the keg and fire up the grill, and cook whatever meat we had handy. Usually burgers or hotdogs.
After college, I moved back in with my parents (and brother, another avid griller), and continued my barbecue journey... grilling in the backyard every weekend using charcoal and a bbq pit.
Fast forward 10 years.
My wife and I are in a backyard design store - they sell pools, patio furniture, etc. And on the day we were there, the proprietor of the place happened to have a rack of St. Louis style ribs on this large ovoid cooking device on the patio of his shop that he called an Egg.
What the hell?
Intrigued, I asked him about it. He went on to explain the whole ceramic cooker thing to me, how it keeps moisture in the food, easy to keep temperature, how it uses hardly any fuel, high temperatures, etc etc etc.
Then he offered us a sample. Crack dealer!
My wife and I both obliged, out of courtesy, as we both feel it's quite rude to turn down free food.
10 minutes later and half the rack of ribs gone, my wife is "egging" me on to buy one.
2 hours later (and $1200 lighter in the pocket) I'm home assembling our new large BGE with a boatload of accessories...
Our lives have been changed ever since :D
So how/when/where/why did you buy your first egg?
Every time I light it up, I truly regret not buying one sooner.
In my case, it was complete ignorance - I didn't know these things existed and the day I found out about them, I bought one. Really wish I had found out about them sooner!! :D