We had some nice Spammers around, that gave pretty decent answers, but always included a spam link at the end.
After some posts, I started invalidating the links, either by removing them or by surrounding them with square brackets. Needles to say that I also flagged and downvoted.
How should we handle this?
By the way, I am strictly against removing the link and keeping the answers, I doubt that they are not simply copied from somewhere else.
One example of the 'good content - bad link' posts as a picture, this was taken from the edit history, to show what it looked like before my edit and before it got removed.
This was not the only post in that style by this user, and even other accounts were used (today and yesterday) in the same manner, linking all to the same or similar sites.