A lot of what was just said above is true, but maybe in a different sense. There is a very successful professional on here that talked about this. He said "His style, his processing is his product. He's worked hard to develop that look, and is clearly represented in his portfolio. People retain him because of his product." It's like if you go to a Chevy dealer and say I want that model but I want a Ford grill. In photography as in any product, differentiation in a competitive market is what brings in sales. Just be sure to stay abreast of trends, so if you need to "change the grill" you can make adjustments.