Another thing to keep in mind is that all the accounts you sell, you also have to service them. You are sales, customer service, and retention for this low budget crackerbox. It takes volume to make money there and volume will be the end of your time as it sounds like there is a bunch of cancellations and charge-backs and holding deals together.
They do not pay on any contract less than 6 months. I do not know if the product works or not, however, there are a TON of SEO companies out there and it is a very noisy marketplace and did not see very many testimonials.
This company appears to exploit and burn salespeople as many companies do. YOU ARE FORWARNED