For me personally, not additional bonuses from the project are important, but the effective work of the platform after the official launch.
Yes, effective product operation is a priority. But if due to various bonuses in the circle there will be many tokens, an increased offer will appear. This will reduce the market price, which may cause unreasonable panic.
The investors with bonuces have advantages before the investors without bonuses. But usually price falls down not becouse bonuses but becouse after ICO bountists sell tokens. Some people buy tokens not during ICO but after ICO when they start trading at exchanges.