Yup I’m a serial entrepreneur, most of my startups have specialised in the pharma industry; recently in contraception. I tend to take an idea from inception to IPO or private buyout then bail on to the next thing.
You win some you lose some, I’ve made a small fortune over the years but lost a big one 🙂
Edit: My advice would be not to worry too much about the rigidity of the business plan, they very rarely end up anything like what you originally envisage. Also don’t rely too much on “experts” – you can do a lot of the donkey work yourself. Oh and don’t spunk your investment money on toys and expensive crap for the office that you don’t need 😳 Oh yeah and don’t worry too much about having a USP, there is room in most markets for a number of players. Oh and be prepared to lose friends and alienate people if it’s successful, it’s weird how relationships can change due to the the pressures of work etc.