Therefore, if this account is an alt account, why not post with your main account?
Buying and selling accounts depends on Merits. If the member can collect them easily, he will not try to buy an account.
Also, many signature campaigns are asking for higher standards than just a rank, as they require obtaining merits in the last 120 days and more. Therefore, unless you improve the quality of the posts, you will not be able to achieve any income from buying accounts.
I do not know, but I am certain that the volume of accounts that are sold annually may be less than 1% of the total accounts, especially for the higher ranks.