Gold Farming (pillaging/repairing improvments outside city borders)

If you go liberty and find many citeis with many buildings, you often find urself short on cash. Here is what you do. Go burn some enemy city then place unit son all his former improvments( farms, mines, cottage) , pillage and immidiatly repair with workers. It shoudl take 1 turn to repair if you have pyramids or worker policy iunder liberty. So in 1 turn u can pillage it, repair an dpilalg eit again. Given 4-6 of those hexes you can cash about 100 gold per turn. This could be done non-stop for the rest of game. Yes, you will need to support those units doing this but you more then make up in gold pillaged. Best thing to do that with horses, or norwegians units- who cna do it mutiple time sin a turn.