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This thread was added on September 18, 2019, with posts from JagexRowley.
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.
You can use medicinal and/or delicious honeycombs to bring up animal health and/or happiness at the point you need it. Can't be sure what their prices will settle at now, but that's an alternative. You can make your own honey on the farm with woad leaves and marigolds.