Would you trust an account that has a proven and long trading history?
Would you trust the same account with a notice "ownership changed"?
Yes, up to some of the value of the account even if I knew it was sold, depending on other research such as for hacks or other questionable activity..
If I was to place trust beyond the typical value of the account, such as to a "long trading history", then I would be trusting the person's identity and would be looking for a common business address of that identity, a signature of the identity, recent use of the actual identity, etc..
On the other hand I would also trust a good identity posting from a newb account, or an account with no value.