I believe most people are here for bounties. But you're right because most users left from bounties.

First thing is the market condition is not good to get investors, then most ICOs were failed recently. ICOs were failed me no bounty rewards.

The next thing is there are so many scam ICO projects.

The third one is low allocation. Most hunters are don't like to go with low allocated bounty campaigns because they're not getting enough rewards.

The fourth and important one is a number of participants. Most users are cheating bounty campaigns with multiple accounts. Bounty managers fail to catch those participants. Then most single participant not getting enough rewards.

There are so many bounty campaigns. Then hard to choose good projects. But you can do your own research before start working on bounties.