A bit fishy....

Well everyone has to have a hobby, and if you take your hobby seriously, you will spend time and money in the pursuit of it. Combining a hobby with a pet or pets is a neat way to have a hobby with added interest. If that involves an aquarium, then it's guaranteed that this is a pursuit that will keep you happy at home, apart from those frequent trips to the aquarium store.
In fact there is a lot of technology involved in keeping a good quarium going, and my preference is to consume rather than observe sea-creatures. However I can see the attraction of maintaining the best conditions to keep those beatiful tropical fish healthy and happy. There is the cleaning and the aeration of the tank to consider, the lighting and heating too. It's not just a case of whether to go for the sunken galleon or the figureine of King Canute resting on the bottom of the aquarium.
I prefer the great outdoors myself and would plump for a dog rather then a home-bound pet, but then you have to spend a lot of time exercising a dog, so the fish are starting to look more attractive.