Conversion directly depends on a sales copy.
When you invest on your time and money on a killer product, you want your sales copy to bring you lots of sales.
The challenge is, if you are not backed up by big affiliates, you are unsure of the return on investments. So, you are afraid to invest on outsourcing your sales letter. So, many of the WSO vendors end up writing their own sales letter. Many of them don't even know the basic of writing a sales letter.
The question is - have you ever written your own sales copy? What was the result? Please share your experience.