After the account is returned it will likely have lost all value.
No accounts are returned the same.
Why don't you save your bitcoins and just involve yourself in the community. And eventually you will have the trust factor you desire. But then again "buying/renting" accounts is not about building trust factor is it?
They are not for trust just for status.
How can you guarantee that you will return the account as it is? No new posts, no activity on it at all?
My only guess is that the OP wants to buy it for signature campaigns, and make some money that way.