Unless the balance changes drastically, when you unlock girls' upgrades to level 200, the shares seem meaningless now, and could as well be removed (as well as Shares-are-Queen upgrades).
Anyway, the game would be much more interesting for me, if the ascensions were based on total shares. As it is, getting a few times to lvl 1000, I seem to tinker with skills and upgrades after each of the first 3-4 skips, and after level 300 I just mindlessly beef up girl #13, and then just 1-click add max levels to as many girls, as needed to be able to sell shares. Thinking and planning seems to have been mostly removed from the game, especially that after next ascension even the skills can be changed for free.