1) Is the market there?
Now this seems like an obvious one but there are many people out there who have created a product and then tried to find someone to sell it to.
Bad idea!!
Even if you are the top copy in the world, you won’t be able to make people buy something they are not interested in.

2) Is the message right?
Getting the message right for the market is the second thing you need to look at.
Many people have not spent enough time figuring out what the market really wants.
And here’s where it gets complicated,
What the market says they want and what they really want can be radically different.
Pay closer attention to their buying behaviour and not to what they say they want

3) Are you boring the pants of them?
People’s attention spans are shrinking rapidly these days, yet so many sales letters fail to take account of this. You need to make sure your readers are with you every step of the way.
This will mean looking at ways in which you can keep their attention.
Creating curiosity and making promises are great ways to achieve this.
Some more ways are keeping your copy shorter, making every word count and letting the graphics carry more of the weight of the sales message.