Board Thread:Spoilers!/@comment-1916997-20150313202428/@comment-25375217-20150506161138

They've confirmed that we will see the price of sharing a heart, just not this year. This year was kind of full with giving backstories to all of the new characters introduced in the Frozen arc and dealing with redeeming Snowing from losing Lily and keeping Emma from going dark. If Season 5 has less going on they'll probably address it then.