I did not participate in their bounty campaign because I did not like the IMO idea from the beginning! Investing in IMO ecosystem is just wasted of time, too much pain and no guarantee for profit. For these reasons, IMO project is dying already, no one investing there anymore. All of their projects are unknown then why someone would go for those projects. I suggest everyone just ignore this IMO sale system.
One of the draw back i see with IMO sale is the lockup period for the sale in IMO platform, i don't think many investors will be happy with such long period of lockup, another thing is that IMO is not very known or better yet only few people know IMO as of yet, even the projects listed on IMO platform are not very known to many people also, so very difficult for many to take part,
And for the bounty campaign, the problem was that the lockup part was not very clear to many participants, i myself included, i thought maybe participants won't be included but i was wrong,
i can't really say if the imo idea is bad or good for now since still very new but who knows what will happen in near future.