The 51-year-old, who recently described his movie career as "a complete failure" and announced plans to retire when his sitcom 30 Rock ends, told Wired that actors work mainly to pay bills.
"People don't realise actors are like plumbers," he said. "When you invite a plumber to your house and say, 'I want you to put this sink in my bathroom', the plumber doesn't say, 'I'm not going to install that sink, it's hideous. You have the worst taste in sinks!' No, he just says, 'OK', and he puts it in."
Discussing his time as a movie leading man, Baldwin said: "I made films from about '86 until '99. And then things started to really wind down. When your fortunes ebb in the movie business, it's like The Sixth Sense. You're dead and you don't know it."
Baldwin added that his most embarrassing film was 2008 comedy My Best Friend's Girl, in which he co-starred with Kate Hudson, Jason Biggs and Dane Cook.
"[It] had one of the worst scripts I've ever read in my life," he commented. "The movie was a huge disaster. Scathing reviews. And I realised, 'I'm done with doing it for the money'."
Baldwin joked that he could see an acting future for himself in an offshoot of his NBC sitcom as "a sidekick on Jack McBrayer's Kenneth spinoff. We're all going to be working for the 30 Rock page".