When mid demands blue buff.
Several things happen:
I tell them to manage their mana better instead of wasting their abilities on cs.
I tell them to take the rejuvenation mastery instead of executioner as executioner is better on assassins and rejuvenation literally regenerates 3% of your missing mana.
Help me take that fucking ocean drake instead of bitching all day.
Build morellonomicon, or Rod of Ages, both of which grant you plenty of mana.
Play a champion with a resource recovery passive: Malzahar E, Swain passive, Kassadin W, Xerath passive, Twisted Fate's W (Blue Card).
Grab another doran's ring.
I don't owe you shit, I'm not obligated to give you shit, nor will I give anything unless you have expressly shown that you are capable of winning your lane, and if you come in and try to take it without my permission you better be ready to have the IRS come knocking on your door, because that lane is going to get taxed until I've made up for the lost XP you just stole from me.
Blue buff is a privilege, and I _will _ make you earn it, because while I'm playing that Udyr who has to chain-stance (mana consumption) non-stop in order to maintain my movement speed (that's faster ganks for you nincompoops and lane-feeders), or that Maokai with the insane mana costs, or the Amumu who nearly runs bone dry three levels in, the last thing I'm going to do is hand over MY resources to someone who isn't even capable of handling their own for that would be the equivalent of hiring an accountant to handle my finances who flunked math class.
TL;DR You want the Blue? YOU CAN'T HANDLE THE BLUE!
