McArthur has become Palace's record buy after the Eagles paid a reported £7million.
But he said: "I'm not really bothered about that to be honest. I'll just go about doing my job and trying to impress the manager."
Hamilton were also celebrating after bagging £600,000 from their sell-on fee, continuing their excellent start to the season which sees Alex Neil's side sit second in the Scottish Premiership.
"For a club like Hamilton to get the money, it's great for their youth system," McArthur said. "I would always recommend players to go to a club like that where the manager gives youth players a chance.
"Young players playing Under-21s don't get as much experience as playing in first-team games. It's great for Hamilton and the young players there.
"They've had a great start but they have a great manager, good young players and a bit of experience. They've got the whole package and I hope they keep it up."
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