They sort of start to get stupid when you sit down and actually figure out how much it actually does cost to use the boat. Like i said, you really need to be ok with just throwing lots of money at them. The jon boat on a lake isnt bad. But when you need to find a place to keep the boat, other than your driveway, thats kind of the start. I really liked boats. But when you sit down and start to analyze cost to enjoy (at least my boat) for maybe 5 months out of the year, its nuts. Like toast said, introduce salt water and add funds. Salt water fucks everything up. Keep in mind, its cooling your engines. That just doesn't work forever. Add slip fee, insurance, which you really should have, because you are basically floating around with usually a fair amount of gas or fuel, that can become an environmental issues when it stops being contained. Boat insurance is pretty expensive and most marinas will require you to have it if you wanna stay at their place. Then after summer you have to winterize it and store it. Then before you wanna play with it in the spring, you have to de-winterize it and paint the bottom. Then u get to see if it still floats. Rinse and repeat.