I totally agree with that but sometimes people sell their accounts discretely. If a scammer buys a hero account he could have the intention of using a previously trusted hero account to trick people into being scammed.
Personally I think it takes a long time to become a hero member, it's sort of an achievement so I'd never dream of selling mine when I become a hero member.
To directly respond to the OP hero accounts are nowhere near worthless, you can earn over 6 BTC a year as a hero member just by participating in a pay per post signature campaign. If you're on here a lot posting then you might aswell get paid for it.
You two got the points there.
An hero member account wont ruin himself in scams or so.
Other different thing is if the account has been bought.
So in my opinion, hero member accounts are not worthless, however if you are going to trust someone (maybe for an off market trade), if possible always use some escrow.