Sorry, I do not buy CoC accounts.
My son wanted a clan so he could attack other clans, that was just over a year ago. I found out how to create multiple Coc/gmail accounts on one device, so I created 20 accounts to make a fully functioning clan.
Each gmail account has to be phone verified, and each phone# can only generate 10 accounts. I have access to 2 phone#, so I can only make 20 gmail accounts.