Keep in mind they didn't sell all of the company, only a fraction of it. The biggest shareholders are basically the same as before the IPO... the idea is not to

Keep in mind they didn't sell all of the company, only a fraction of it. The biggest shareholders are basically the same as before the IPO... the idea is not to price that one day to perfection, it's to maximize the value over a period long enough to unwind the rest of your position in the secondary market. If you IPO a company and the IPO "busts", it reduces investor demand for shares when you actually try to sell the rest of them out into the market.