Not enough habitats
Too many new dragons, too quickly
Removal of old dragons
Parity issues
Game crashing/ difficult scrolling,visiting
Prices of upgradable features( eg. Habitats,stables)
Friends/ neighbours quitting
Gold traps
Lack of communication from Team Lava
Boredom
Last year i was sooooooo angry at DS as i was stuck for months without any luck of breeding any good dragons (kept getting life, fruit, firestorm etc) that I decided to quit playing DS. 3 months later my mom orders me to start playing again... to send her gold everyday. It was only after months of absence that I manage to have luck getting dragons again.
In Feb this year, i lost all breeding luck and wanted to quit again. When i returned 2 weeks later... TA DA!!! My luck came back for a bit. Manage to get all my valentines dragons. When mythic came out, i did the same tactic again. I left DS all alone for a week. When i returned, i got a 4 leaf clover and easter dragon while trying for Mythic. And now the luck is gone again. Its quite sad that I have to resort to this method just to have the tiniest luck in getting anything good.
So yes... in this game its really all about patience, perseverance and strategy. I got my crusader dragon from breeding a pure diamond & fire. Took me about 200 - 300 tries a day x 3 days to finally get it.
Why oh why did TL had to make breeding so darn difficult. sigh.
Difficult means that we have to buy the golds
That's the developers objective i guess. The harder it is the more frustrated you get. And when that happens... you might just buy gold and that's how they make money.
I've only bought gold once and that too was expensive for me (due to currency conversion). So i save golds given from friends for anything i need like a new nest but never for a new dragon.
WOW. what combo was your quetzal? I tried that tactic with the crusader at first. Got fed up after a day. Few days later my mom insisted on me trying for it again (a friend of hers got it from that combo on 2nd try). And 3 days later... i finally got it. DS making us all jump thru hoops to get what we want.