First thing of me to do is to check of the bounty administrator. I based for their past recommendation that there's a lot of ICO's here are successfully launched to the exchange that both investors and bounty hunters are happy for the result. They got well paid and investors had a good profit. Tracing their works might be useful for you to come up investments or taking bounty.
The way of your searching is really good. But we rarely findout those kind of campaigns which are managed by well-reputated bounty admin/manager in this current time. Nowadays, only scam bounty admin/manager who are here in this forum only to launch their bounty/ann to collect funds from investors and there are no real use-case of the projects. So, it's always better to look into the "scam accusations" or scam busters are doing their jobs by flagging the projects to make aware among the investors/bounty hunters which the best way to know about the projects, Imo.