They are the largest fw turtle species. Certainly not a "pet" for the average person. I would never adopt it out to anyone who didn't have the facilities to care for it it's entire life. But believe it or not, there are folks out there with series of fenced in ponds in their yards and tons of indoor aquariums just for turtles. I'll try to get some pics up of the facilities the guy has I got these from next time I visit.
Nothing good happens fast in an ecosystem.