Yea, it's work. You need lots of fish to breed, you have disease outbreaks, feeding and cleaning gets to be a big job, water costs, food/meds/filtration costs, weather and climate have to be controlled. A prolonged power outage can wipe you out.
It's a lot more planning involved than just keeping a few tanks in the house.
Then you'll have to ship and transport rays--they're kinda dangerous.