joining a bounty or an airdrop is not a big risk because you dont need to invest any capital on them but there is a big possibility that you can earn boat loads of cash on them if ever you got lucky on your chosen ico .

  i already witnessed many people that they earn a lot just by only joining a bounty and an airdrop , of course i am one of them .

 therfor , your calculations above are not really true but i do somehow agree that if you bet a high amount of cash on a gambling , you can also earn a lot of profit if ever you win but of course the risk is also big .