IPOs - All gone bust

I had a major argument with my peers when sensex was reigning 18-20K.
My view has been not to bet on IPO as gamble. IPO were selling hot cakes just because they were shorcut to double money. Well unfortunately, those who are sharp make money and exit but layman in general gets greedy to keep stock making more money.
Result- Sensex came down and IPO dreams got busted. Today most of IPO are trading at 40-50% discounted price.
Stocks are not gamble, they are be played with calculated risks for making all profits.