What the wallet you sell private key? Trust wallet,Metamask or Eth wallet what do you mean.It's very risky to sell this.People  doesn't buy this wallet.What is a garuntee that you wont`t sent your assets.I think it's not a better option for you and another one.People don't trust you and if any person trust you what is the condition you sell this you don't mention it.Whatever  i think your need another better option.I hope you understand what i say.