Totally true! If you're an expert of how to choose a bounty then you have advantages.
I'm a newbie when it comes for choosing a bounty but for me it is okay to waste my time, I mean if their not going to pay me, karma will do for them. I got so many bounty and I know some of them won't pay. Being in this kind of world we can't tell who is legit all we have to do is trust the BM, Do your own research and do your task because we choose to be in this kind of world. Who knows someday we can caught our own big whale, just be positive!