It's a money-making game that everyone wants to play, as long as they think they have enough cash to do it.
A friend of my husband actually does it for a living... He used to rent older and slightly dodgy places (houses,
condos, etc.) for periods of 5 years or more. Then, he'd improve the interior slightly (coat of paint on the walls, new kitchen cabinets, cheap but cheerful Ikea furniture, etc.) and then rent it out again to someone else for 2 or 3 times what he's paying for it. Then, he's pocket the difference and use the money to fund yet another flip scam somewhere else. In case you're wondering, during this period, he'd live in some other cheap rental unit somewhere (usually with cockroaches and a mouldy sofa for company) or he'd go back to his parents' place and crash in their spare bedroom (he's their only son, so they're pretty forgiving).
Eventually, he accumulated enough cash to put a downpayment on a beautiful $2.2 million Peranakan-style conservation shophouse in Katong, and just as we all thought he'd move in there with his new wife (he'd somehow managed to convince his long-suffering girlfriend to marry him). He promptly moved her, their 2 dogs, and all the household possessions that they'd purchased so far back to his parents' place, because he'd gotten such a good rental offer on his new house!
Needless to say, his wife was pretty pissed... but he says that this is the way the game is played in Singapore! Sigh...