I've (along with many others) have suggested this before, and still think this is my #1 - there's no realistic way to continually keep up with evolving the dragons without any way to actually grow food at the level needed. It really has slowed the game to a crawl for me and I am losing interest especially since the newer hybrids are way too hard to breed, a lot of the newer dragons being rather unattractive, and the food amounts have becomes extremely unreasonable. There's no way for even an upper level player to get the coins needed to keep up with the food. I'm a level 88 and struggling.
Food is not the only issue though - gaining coin is a problem too. I'd like to ask how come a water dragon can be sold for 1000, and air for 250 and all others are only 100? I'd like to suggest -*again*- to adjust the amount of coins that can be earned from the sale of a dragon according to its rarity. Does that mean breeding for gaining coins? Probably. But come on - with low cap limits on expensive habitats, it's too hard and way to slow to earn the amount of coins to buy more habitats and *gasp* grow food. Give players another way to gain coin!