It happens quite the opposite. Bounty hunter tokens have not yet been paid, and investors who bought the token with a big discount start selling and the price falls. But much depends on the state of the crypto market.
Sometimes price of tokens falls two of three times from a nominal price. But during IEO there is no so big discounts.
After placing a token on the exchange, its price will definitely increase, even with a bearish trend in the market. I predict 2020 to be successful and vibrant. Then the project will have even greater success.