It is generally advisable to create a throwaway account when you want to sell your account. Many people don't want the fact that an account has been sold to be publicly known, even if they are just using it for signature campaigns
i think that's very troublesome
it is because the trading of accounts is generally frowned upon even when there are legit reasons to trade them. Buyers are afraid of receiving negative trust for buying an account which would make it worthless for most signature campaigns.
The mindset has been reduced somewhat recently but some people still strongly oppose it