Target market or large casting of net?

I would like to start a marketing agency. Should I focus on clients in a particular industry like skiing. Or should I have a "motto" and target everyone?



My previous work has nothing to do with the ski industry (NASDAQ advertising, and NCAA advertising), so the previous work holds no creditability in the ski industry.



Its still in the thought process so I wanted to get everyones option on which approach would be better before executing.



Thanks

via Small-Business-Forum.net http://www.small-business-forum.net/starting-your-business/9964-target-market-large-casting-net.html