We have so much monsters, but only a little part of them are we able to get with breeding.
I know because of the free-to-play-thing u need a method to earn money.
But i think it will make the game for players, who don't want to pay so much, much better and raise the longtime motivation.

Example:
Cthulu, you need him to breed Netobus, but the only chance are gemstones, frustrating!

My idea is to make more old monsters able to get with breeding.