You know there really is no need to re invent the wheel. If you are looking for a business model that works or a system that is efficient and effective then why try to re design or come up with something new? If it works, then it works, right?
There is nothing wrong in building on the success of others. Just steal their work and make it work for you. Do you think that I designed this website? No, I just looked at what worked and went from there adding the unique content relevant to our business.
The only thing I would say is that you should be unique and innovative when it comes to the one thing that you want to be remembered for. So for us its getting to know our clients. their businesses and providing a personalised service.