Realistic bounty rewards are always at the highest of 500k, those showing millions can't be trusted, they will surely dump in price when they hit exchanges and mostly the devs have nothing good to offer i think they just want to seize the opportunity to raise good money in ICO or IEO and run
Some old coins like DeVCoin will just change the bounty to reward the admins with your work
Beware old coins that change admins