Does it though? In my experience a good product or service doesn't require constant spamming. It has nothing to with whether someone reads HN or not.

I'd wager the initial greeting works, but I question whether the person's lack of self awareness (when it's clear that the customer doesn't have time to do small-talk and has been evading you for 3 weeks straight) wouldn't be grating to most people who are trying to evaluate several products and get some work done.