Having a long career and an extensive file of published work helps generate "found money"--additional money for no additional work. It can even turn non-profitable projects into profitable ones.
Way back in the mid-'80s I had a short story published in a popular mystery magazine of the day. The acceptance indicated that I would be paid, but I never received a cent and the magazine went out of business. In the early '00s, the story was reprinted in a small press mystery magazine, but no payment was offered or expected.
The story was recently accepted by another publisher and the contract indicates that I'll be receiving payment in due course. It'll be a nice chunk of change--enough for dinner and a movie for two if I don't go overboard--and that's not bad.
Twenty-plus years to turn a non-profitable project into a profitable one seems like a long time, but any income beats no income and "found money" is always welcome money.