Ask HN: Typical Startup or Abuse?

Over the past year I have been working for a local startup, in the United States, as the Jack-of-all-trades. We offer a product specialized to a fairly niche industry that is doing fairly well. In the past year we haven gone from 2 to 75 clients, gaining around 3 clients per week in the past two months. The product typically nets $5,000/yr per client. The product itself is web-based running off of an opensource CMS. For the first 10 months I was the only person in the office doing work ~9 hours a day. From client setup, to design, to code and deployment I did it all. Twice a week I would be joined by the other 3 part-time guys who would do what they could in their 4 hours they had. Besides myself and the other team members the founder would do sales two to three days a week part time. Now a year in we have eight full time team members (5 Dev, 1 Sales, 1 CS). My role in the company has now taken on the Jack-Of-All-Trades plus the management of these other team members. Which I consider