To answer your question: I'd say you should live aboard because you want to, and not because you have to or feel that it's a cheap way to make ends meet. I've found that on a little boat you have to be prepared to shop several times a week because the fridge is tiny and there's no cupboard space, you have to buy and lug gas bottles about for hot water and cooking, buy and lug sacks of coal around in winter, and keep the water tank full and the toilet empty. Just keeping on top of these the essentials can drain your time, and your emotion when it all goes wrong...
Our boat, for example, was cheap with a sound hull and a good engine, but I've become an electrician, a carpenter, diesel mechanic, a painter, a sealer of leaky windows and flues, learned more about solar panels and batteries than I dreamed would be necessary or possible, and replaced a surprising number of chimneys (stainless next time!).
And if you do want to, and are prepared to put in some quite hard work just for the essentials that house-dwellers take for granted, it's an enjoyable and rewarding lifestyle - I wish you the best of luck!