Yup, one of my clients was an actor, and had a regular, but incidental character in an 80s/90s long running series. Never any story lines about him, but he'd pop up in most episodes, spanning over a decade, saying just a line or two, or just in the background. (I wish I could say who he is, but it's confidential to my profession!). He still gets decent sized royalty payments, not just from the UK re-runs, but also from DVD sales, but also from downloads, overseas TV showings, etc. Obviously only a fraction of the amounts the the stars will be receiving, but for him, it's a good add-on to his pensions, even though the figures get lower by each passing year as the series becomes less popular and the royalty periods are expiring.
But aside from that, he got other "bit part" acting jobs in lots of other TV programmes, and also some appearance fees on chat shows etc., though he's never even been asked to do any "sleb" series such as Jungle etc as he's not "relevant" to today's audiences as he's no longer working at all, and he's not a "household" name from the days when he was working either!
But being a "bit part" for so long for a decade or so certainly gave him a very comfortable living!