Some bounty hunters chooses ICOs that has a potential to grow after the official launch because this will give them a good profit out of the bounty reward. Personally, I already tried investing on an ICO but not during the pre-sale period but already after the official launch where token prices drop below the ICO price after hitting the exchange. After receiving the bounty token rewards, I bought more tokens because I believe on the project's potential and hodl it for few years hoping to have a good profit out of it