can we really buy these things? why you are not using your legendry account?
Yes, you can buy it but there is always a risk that it might be a scam. Also even if you successfully purchase it, your account might end up tagged with a negative trust rating by DT members. Many Bitcointalk accounts that have been purchased end up receiving a negative trust rating. Buying bitcointalk accounts is not recommended because most bought accounts are used to scam.
If he is using that Legendary account, it might also receive negative trust rating that's why he's not using it.