it is very normal to ICO projects to be dropped down after the success on the sale. because people who are invest in are want to earn profits  even they only got a small percentage of profits per projects, so instead ICO grow investors dumping theyre coins that they have and naturally the price goes down, meaning even a good projects can be manipulate the price because of some investors who are greed to earn profits after the ICO.

and to find/choose a good bounty, ICO must have a good team, roadmap and of course a good to be true announcement that indicates all the information about their projects. dont choose a bounty that managing of newbie or jr member, because 80% of them are scam. i already got scammed many times because of those low rank who managing the bounty and at the end theyre got away after the ICO.