Latest Answer: When cash flow was tight and interest rates were high, builders were being forced to sell properties during the pre-launch stage itself at discount rates to attract more and more buyers. They were increasing the sales through such methods. Several big developers like Lodha, Unitech, DLF, Godrej Properties, L&T Realty and Indiabulls have also followed this trick.. but now since the sales are picking up there may not be a need of such things, unless buyers get bored up with the same style.