Fish in captivity usually have lesser chance of survival than in the wild. 100% of the cause can be contributed to the fishkeeper. Careless things that we do can cause a completely wipeout, even if the fishkeeper is carefull at 100% of what they do, people's interests are usually shorter than the livespan of a fish itself.
Dats lives a very long time, oer 10-15 years, but I seriously highly doubt that 90% of all the dat keepers keeps them for more than 5 years. Peoples's interests and liking change from time to time. The sad thing is that after they get bored, the fish are passed on to another keeper whose the mortality rate increases again for the fish.
And the cycle continues...Very few ppl have the capabilities (space, time and money) to keep this fish for a very long time. Very few ppl have proved them, but most of hobbyists simply only have 1 or 2 out of the 3. Unfortunately it takes all 3 to keep any fish alive.
Stan