Board Thread:Questions and Answers/@comment-4810467-20130904154404/@comment-16909581-20130904161604

Yeah honestly once you get into some kind of pattern speeding up breeding is just a waste of gems. DeeMac is right, if you want to completely upgrade a castle on any basic island (exc. gold and ethereal) it costs 25 gems per castle. I would just save them until something seriously worthwhile comes that costs gems but don't spend it on rare monsters even ones that may seem to take forever either ;) for one thing it defeats the fun and two the rare ones all cost into the thousands of gems, so you might save enough over time but if you buy it you'll have to start all over again. For instance if something like the original mine comes out again and costs gems but would be worthwhile investing in (about four gems a day i Think it was) then maybe use them then, but only if it can help you make them up fast