You're right. Good point.
The miles were out of the account. I took back the account. Changed the password etc. Later I saw they were never used just expired. Seems to me if the buyer implies the account is mine after he uses the miles then him letting them expire is him using the miles. Meanwhile I actually did try to contact him and never got a response. After that I had no issue using them.
Again, maybe that's not right but that's where having rules written would help a lot.
That's a totally different story.
In my opinion (yes, it does matter), you sell
"miles" not the
"account", as anyone here would agree I'm still allowed to credit my flights or CCC miles in a sold account and I can hold the buyer responsible if he uses the account in an irresponsible way which might jeopardize the account itself.
But after all, YOU SOLD THE MILES. Period.
You have no ownership on these miles. You sold it and now it belongs to your buyer. Yes, like a car.
And don't come with that corny joke of getting the car out of the garage because you well know it doesn't work that way - you can't just call a tow truck to get the miles out of the account. Sometimes the buyer didn't yet have a chance to use it.
Someone who tries to argue with the above makes a fool of himself and unsuccessfully tries to do the same to me and other readers.