Avoiding locks/bans on sold accounts.

[The Devil]

I'm assembling a team to create hand made accounts for an account shop I am preparing.

The plan is start with tut island accounts and maybe some other low value accounts like air orbers until I have enough rep to sell higher value accounts. (suggestions welcome )

All accounts by my team will be hand made, so I'm really only worried about the best practices to make sure an account doesn't get locked/banned after I make a sale.

Currently the only plan I have is to provide US proxies to my team and hope for the best. 

[Kramnik]

Use good proxies when creating accounts and use good proxies when using the account. Thus both you and the buyer should have good proxies to not get locked