Good luck with your service, I will list some questions below which I believe many are wondering, but probably wouldn't ask.
I've never seen you talk about seo or anything related on this forum, how suddenly you are able to sell keywords? We all know metrics don't mean much in seo, specially in determining competition of certain keyword, so experience is needed.
Are these keywords buyer intent? There is a big difference between keyword "best product" and "product name" simply because google algorythim works to serve visitors what they need, if they just search "product name" they want to buy that product and they will be served with ecommerce sites, it's very hard for affiliate site to rank for this type of keyword and certainly produces less revenue, but for "product review" and "best product" it's very easy. So what are your keywords like?
Does this service has anything to do with Ste's previous keyword service? Sales thread has a similar style.
He claimed he used custom software to find keywords, are you using anything similar? If not, how are you finding your keywords (I am not looking for step by step answer, just broad like I have a software or I have a huge list of keywords which I obtained through...)
I am not trying to make your thread look bad, I simply think many people would be interested to know this before buying

Good luck with sales!