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Goldfish are pretty hardy fish. They can live under less than ideal conditions for a while, but their natural life span is decades. Yep, decades. If they die any sooner than decades, it means their living conditions could be improved.
It really is not that expensive to set up an ideal aquarium. Initial investment for a high end setup could be a few hundred dollars, but after that the only cost would be fish food and water conditioner which are both fairly cheap and can last for a long time. It is much cheaper than owning a dog or cat as pet.
Personally I prefer small sized tropical fish, since I can have more of them in the same sized tank compare to having goldfish. The only extra equipments to set the tank up as tropical is a heater and a thermometer.
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