I used to be land based, but not anymore after discovering kayak fishing, which has opened up a whole new range of options for me. Be it fishing up some backwater or some nearshore reef it realy opens up many options without breaking the bank. Furtermore it opens areas to fish that a boat would not normaly be able to acess.
Don't get me wrong boats have a place but not everyone can afford one, however a Kayak is a fairly cheap way to get on the water.
When you look at getting a boat things can get costly real quick with fuel, boat rego, trailer rego, storage, servicing and maintinence ect all adding up. A lot of boats stay locked in the garage most of the year because the owner can't afford to run it.
A kayak uses no fuel, takes up little room at home, does not need a registered trailer, or boat rego, little if no maintainece, and can be launched from may a place. It will keep you fit, you will catch more fish than being land based IMO and can be used for lesiure if you wish. Best of all it is one of the cheapest ways to get out on the water.
It does have some disadvantages too, but these are outweighed by the positives.
Check out what some of the boys have done on the Australian Kayak fishing forum http://http://www.akff.net/forum/index.php with their kayak fitted with fish finders and lecky motors. Catching big spanish mac, snapper, sharks, flathead, bream ect.
Her's a pic of mine.