That's true, but not all of the bounty hunter have the same thoughts as you. For me the big allocation is not a good reference, you should research information about the project, team, roadmap and etc before participate in the bounty campaign.
And these projects that allocate like thousands of tokens usually end up with no value at all. Or all that token could worth less than 2 or 3 dollars. If it even gets listed. Usually its not worth someone's time and effort. Few people actually take time to follow projects and invest because of it's potential use. That's how icos became a hotbed for scams a couple of years ago.