An interesting post from another web site...
I've heard Vicky Lawrence say that her residuals for Mama's Family were something like $100 per month- not much at all. In a recent interview with the very bitter actor Kevin Hagen (best known as Doc Baker on Little House on the Prairie) he said he receives about $8 per week (but then he never had a contract- he said that if he'd had a contract instead of being pay for play he'd have earned well over $1 million since the show's demise [which was the point of the article, a 'Michael Landon was a greedy scumbucket' rant]).
Some residuals trivia:
Jack Klugman & Tony Randall both earned much much more from residuals than from the series The Odd Couple. Ditto Werner "Col. Klink" Klemperer, and Bob Crane died very strapped for cash but had he lived a few more years he'd have earned millions as his residuals actually increased [I think he owned a part of the show, which is where the real money is). (I don't think the producers realized quite how much money was in syndication during the late 60s and early 70s and thus they signed away more than they would today to moderately successful stars.)
Redd Foxx, who had a lifelong history of really bad business practices, signed over his residuals to Sanford & Son in a divorce settlement rather than pay his wife something like $800,000 and consequently he died penniless and she is still raking it in.
In the 1990s Audrey Meadows was still receiving residuals from The Honeymooners. She was the only member of the cast to have demanded them during contract negotiation.
None of the children from The Brady Bunch and none of the castaways from Gilligan's Island received residuals after the third repeat. Carol (Florence Henderson), Alice (Ann B. Davis) and the estate of Mike (Robert Reed) still receive them however; the kids got royally screwed by their management evidently.