When optimizing your website or landing page for conversion, the most important thing is not on the page itself. The most important thing you can do to increase your website conversion rates comes right before the request or the buy button. The space before the buy button is where you set up the benefit of influencing on fertile ground, because conversion does not happen on a web page. It happens in the mind of your prospect. This is what the true masters of influence like Robert Cialdini know, as described in the best book on influence and conversion rate optimization ever written, Influence: Science and Practice. I highly recommend you buy it and read it twice.