Originally Posted by
amarc1701
Well I'm not trying to borrow the money. I have the money I just want to do the transaction via AMEX.
I mean why not? What's the point of doing large purchases and not use it

Because AmEx isn't going to process the transaction (and give you points) for free. And it is highly unlikely than any of the other parties involved are willing to take the ~2-3% hit for the transaction charges. If that's a rate you are willing to pay and can afford for the points then just buy them outright from AmEx.