My problem with flying cargo was I got really tired of being really tired. It was all all night flying. I flew a lot of red eyes flying pax but it was usually one or two a week. Not every night. Plus I worked for a low rent cargo carrier where it was always a dark and stormy night flying a broken down old airplane. I then worked for a major flying shiney new planes that were well maintained and paid a lot better. I'll take the passengers any day. As far as being exciting the freight with engine fires, high speed aborts, and cockpits held together by deferral stickers was much more exciting.