Suppose you show up to buy a truck with #30K in cash (the truck is listed for $30K). You inspect the truck, and find that the A/C needs to be fixed, which would cost you, say $3K. So you decide to split the repair cost with the seller, and now the truck will cost you $28.5K. If you have cash, this is simple: you just hand over $28.5K. But if you have a cashier's check?
When I show up to buy a vehicle, the only thing I'm doing is taking it to a mechanic for a look over, and completing the purchase if it's all clear. That's it. The time for disclosure and negotiation is over. Not negotiating things in person (as opposed to over email where I have it in writing) has saved me countless hours over the years and made buying things much more pleasant.
because people forge cashier's checks far more easily than they forge cash. I certainly wouldn't take one as payment for a truck without going to the issuing bank first and withdrawing the money (as cash). In which case, there is no need for the check.
The owner straight up asked me if I was a drug dealer though, so I see your point. I had to show him my tech company offer letter for him to believe me.