buy 2co account created before 16.12.2005 they prohibited some products to sell, but if account was create before 16.12.2005 - 2co don't close such account even through it sells prohibited products. So my site sell prohibited now products and I search to buy 2co account created before 16.12.2005
Why not? Seller give to me his account login/password, I change account site URL to mine and start to use old account with my site
Because the agreement is made with the original account holder and not you. I know technically you can change the details but it is contractually not correct to do so besides all old customers need to agree with the new contractual terms before being allowed to continue using 2co. Under the terms, you can only transfer a 2checkout account if the site it is attached to is being sold, which means all sales will need to be transferred to https://support.2co.com/deskpro/faq.php?do=article&articleid=281