Whether God electing certian humans to be created and to be fallen would be considered to be unfair?

No. It would mean that God chose certian people out of a lump of unfallenness. The choice had nothing to do with whether or not these people were good or bad. It was on the pleasure of God. Keep in mind that election and reprobation are not... actions of condemnation. So although God chose to work in one group above another, he did so on the basis that these particular groups were not good or bad (They were in a sense neutral). It is there fallen state which is the reason for their condemnation. Because all men are sinners (bother elect and reprobate) none deserve to be saved. In the infra camp, they cannot seperate reprobation from condemnation.
So the real question when it comes down to it is not why not save more people, but why does he save?

Scripture verses: Romans 9:13; 17-23

And it is because God is the potter and humans are the clay in which we can not talk back to God. No one can say to God what have you done. Because God has full rights over the clay pots. Daniel 4:35 - What have you done?

Logical Order of Decrees

In the Supralapsarian camp God determines to save some (The elect unto salvation) and others not to be saved (The reprobate unto condemnation). According to the Supralapsarian position, "God, even in the decree to create and permit the fall, had his eye fixed on His elect individually, so that there was not a single moment in the divine decree, when they did not stand in a special relation to God as His beloved ones." Louis Berkhof. Thus although the divine decrees are different and distinct nothing frusterates His plan in accordance to the Supra position for God's plan to magnify his glory by the salvation of some and pertition of others will be played out. Where as in the infralapsarian position the decree are distinct and seperate. "Infralapsarians, on the other hand, hold that this personal element did not appear in the decree till after the decree to create and to permit the fall. In these decrees themselves the elect are simply included in the whole mass, and do not appear as the special objects of God's love. In other words all of humanity were sinners and so from the mass of fallen (sinful) man God's elect were chosen. This is ultimately the question which comes out of this - was "the fall in reality a frustration of his plan?" because in the scheme of things God first "decrees to create the world for the glory of His name, which means among other things also that He determined that His rational creatures should live according to the divine law implanted in their hearts and should praise their maker. Then He decrees to permit the fall, whereby sin enters the world. This seems to be a frusteration of the original plan, or at least an important modification of it, since God no more decrees to glorify, Himself by the voluntary obedience of all His rational Creatures." So that in the Infralapsarian position God is changing what He wills.