After 27 days, I'm sure the idea of just paying for traffic has probably sprung in your brain.  Is this a good idea or not? Well…..it depends. If you have had a steady stream of traffic, what kind of sales are you getting?  If the conversion rate is strong, then starting a PPC campaign is a wonderful idea.
It's obvious you've got a sales page that people are reading and responding to.  There's absolutely no reason to at least try a PPC campaign and see if you can get some hands-free …