Why do I feel like the whole "must have a certain amount of ETH in your account" is so when they go to hack your account they know it wont be empty?
It could also be so that scammers don't make mass new accts and new myetherwallet address for multiple claims. If they wanted to hack your address they could just look on ethplorer through all the different addresses in every bounty campaign on spreadsheets and get balances anyway. It isn't that easy to hack someones wallet without keyloggers etc so i don't think that is the reason for it.
This is a senseless assumption.Ive do see those airdrops which do require some balance on the wallet but no matter how hard they would do they cant hack your MEW wallet unless if you do give your Privatekeys on those wallet then you would surely be got hacked but if they didnt know it then they cant hack you in.I dont know whats the reason why they do require such thing.Airdrops makes me tired as of now.