It's one of those things, if you can identify it, you can make it yours. I don't really think many are just found lying around but it happens. I have found three 53/54 five cent mules just by being able to identify them over the last few decades.
I don't really care about mules personally, they are no better struck than their normal brethren. There are none in my display set.
Personal tastes and all that jazz.