How to Promote Great Products Your Potential Customers Don’t Understand?

I'm looking for some feedback on my latest sales/marketing text at http://stallion-theme.co.uk/ : selling a WordPress SEO Theme that's better than anything else available.
I'm really good at SEO copyrighting (that's easy), also really good at explaining technical details (in great detail ), but not so good at marketing/sales text that converts.
I loath the really spammy sales text that you can find in internet marketing type products, the "This will make you a millionaire…
How to Promote Great Products Your Potential Customers Don't Understand?

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