Tellers are sales people. If they ask you questions then your response might allow them to bring up the subject of them being able to sell you something, for example if you were to tell them that you were depositing money so you can make your car payment, then they might suggest that you refinance your car loan with them so you wouldn't need to worry about writing/mailing a check, ect.
If your activity is suspicious then they might use whatever response you provide as part of a SAR (suspicious activity report), although the response that you provide is not going to affect the fact that a SAR is created if something is suspicious.
Makes sense. Though idk why I would be makin my car payment to another Wells Fargo account lol
Thanks