HDB flats strictly meant to stay and live in. Not to buy and sell and make money out of it. If need to sell then buyer shld be HDB. If have money then buy pte properties like condo and landed. Pte properties can be bought for investment purpose. Had the garment adopt such policy our children and their children would always have a affordable roof for shelter. Prices of HDB prices would not skyrocketed since teres no buyer.