Yes. The previous incarnation of The Junkyard Dogs (a 4-piece pub band) was a 5-piece including keys.
The first keys player was a mindgames player who thought it fun to secretly sabotage my basslines by furtively using his left hand when no one was looking. No accident, he really did that, because he thought he was oh so clever. When the band finally discovered this, he jumped just before we could push him ... but not before he had recruited his own replacement. Seriously.
His replacement was a much nicer guy but nowhere near as talented, and very lazy too. He couldn't be arsed to learn new songs (Quote: "Why do we need new songs when the audience isn't yet bored with the old ones?") so he used to fake them - play the first three chords loudly, pretend to play for the rest of the song, and then play the last three chords loudly. Again, I'm not making this up.
Eventually we'd had enough, invited him to leave and never bothered to recruit a replacement. We're a far better outfit as a 4-piece than we ever were with a prima donna keyboard player.