I agree totally! This would make things so much fairer for us players. I'm sick of the constant stream of limited time dragons, one after the other, with very little chance of being able to breed them in the tiny amount of time we're given to do so. They obviously want us to buy them - and I refuse to play that game!
I have banned myself from buying limited dragons on principle, and if everyone else did the same S8 would have to re-think their strategy. But I doubt that's ever likely to happen, so I don't expect to things to change!