Hrm. Well, I'm not a salesman. I don't think I can convince you to buy a Zero if the price per performance isn't going to work for you.
IMHO, it's a bit of a disservice to only look at the Zero in terms of cost per newton-meter. There are cheaper options available if your goal is to accelerate. Each of us has a hierarchy of factors that go into deciding on such a purchase. A quick list is torque, comfort, price, ride feel, estimated hassle, aesthetics, social positioning, customizability, and so on and so forth. In my specific case, I'm a tech geek. I love me some new technology and I am an early adopter of a lot of nifty things. The price premium to get on an electric motorcycle is worth it to me. It may not be for you.
I'm sure someone on this board is all about smoothness. Surely someone is all about noise. And I am positive there are several people who want lower emissions. These are areas that add value to the bike. How much value is an individual decision. If those don't matter to you all that much, then an electric motorcycle is probably not worth the cost to you.
I do think that Zero could expand their appeal by focusing a bit less on trying to make it "just like any other motorcycle, but with some nifty advantages" and more towards "check out the cool state of the art bike!". However, that is just a hunch. In addition to not being a salesman, I'm not a market researcher. I have seen a lot of people expressing contempt for electric bikes because they're too different as they are. I'm not sure if it's worth the loss of those potential customers in order to gain the gadget aficionados.
So here's the question: If the Zero SR had LED lighting and reworked plastic, would you buy it at the current price?