Much as I dislike Uncle Joe he did not charge the government when he stayed at home. Trump is billing the government very large sums of money for every stay at his home. His entire entourage including secret service pays him vis the government for their rooms food and other items at very high rates. One article that I don't quite believe says he bills for his quarters as well. He also takes vastly more trips home than any president in history.
Mar Lago is also by zoning and club by laws a for profit club and no one can be a resident.