I was a 14 year old digital electronics hobbyist at that time. At $666 it could just as well have been $1 million. The most I could possibly afford at the time was about $50. For me, personal computing didn't become truly affordable until the Commodore 64 came along in the 80s, and by that point the Apple II was about 4x more expensive. The Apple computers were revolutionary, but to me they have never been affordable.