A while back, my chiropractor asked me how I get clients. My response was "Serendipity". That's only partially true though.
If you work hard marketing, networking, getting the word out about your company any way you know how, serendipity kicks in. For example, I sent marketing letters to big-firm attorneys for a year. I didn't get much work from my efforts: two attorneys hired me for errands and another attorney hired me to get a famous artist's signature on his book at a book signing.