[2019] So am I missing something here? Zygomites are too fucking expensive to maintain and not worth the investment. Can someone please explain why this is fine?

Dragons are about 500,000 gp a week to maintain in food.

The average adolescent dragons sells for 300,000 gp each.

Zygomites are about 5,000,000 gp a week to maintan in food.

The average adolescent zygomites sells for 200,000 gp each.

You won't even make a profit with zygomites because the price to maintain them is too high.